clarifications on specs!
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Get the fuck off my lawn
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ok ive been pondering these claims and ill ask here first to see what people have to say.
ok stock s13 sr20det has 370cc injectors. the stock garrett t-25 is NOT the same as a mitsu t25 obviously since stock dsms can run their t25s up to like 18 or 19psi stock.
now
14psi is the accepted maximum boost level you can run because is it:
a) 370cc injectors max out after 14psi?
b) t25 becomes inefficient at 15psi starts blowing hot air or
c) is it a combination of both?
please clarify this for me because i have heard charles (boosted240) runs more psi on stock turbo and injectors? and i have heard of people running 16psi with upgraded injectors but stock turboes as well as people running higher than 14psi with stock injectors but upgraded turbo.
which are true
thanx
dan
edit: not ragging on you charles your input is appreciated as well because someone asked me about these things and told me that you were running higher with both inj. and turbo stock still. how do you do it?
ok stock s13 sr20det has 370cc injectors. the stock garrett t-25 is NOT the same as a mitsu t25 obviously since stock dsms can run their t25s up to like 18 or 19psi stock.
now
14psi is the accepted maximum boost level you can run because is it:
a) 370cc injectors max out after 14psi?
b) t25 becomes inefficient at 15psi starts blowing hot air or
c) is it a combination of both?
please clarify this for me because i have heard charles (boosted240) runs more psi on stock turbo and injectors? and i have heard of people running 16psi with upgraded injectors but stock turboes as well as people running higher than 14psi with stock injectors but upgraded turbo.
which are true
thanx
dan
edit: not ragging on you charles your input is appreciated as well because someone asked me about these things and told me that you were running higher with both inj. and turbo stock still. how do you do it?
Vechicle Whore
Joined: Jan 2002
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If you want it to live a long time keep it like 12 psi and under. DSMs run their boost high beacause the turbos are a dime a dozen for Mitsu. DSM t-25s die all the time for that reason. Nissan t-25 cost more. They are also not very efficient at levels above 15 psi. Lots of hot air. Ansewr your Question?
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Chairborne Ranger
Joined: Nov 2001
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Originally posted by "Someone"
Originally posted by dan
ok ive been pondering these claims and ill ask here first to see what people have to say.
ok stock s13 sr20det has 370cc injectors. the stock garrett t-25 is NOT the same as a mitsu t25 obviously since stock dsms can run their t25s up to like 18 or 19psi stock.
now
14psi is the accepted maximum boost level you can run because is it:
a) 370cc injectors max out after 14psi?
b) t25 becomes inefficient at 15psi starts blowing hot air or
c) is it a combination of both?
please clarify this for me because i have heard charles (boosted240) runs more psi on stock turbo and injectors? and i have heard of people running 16psi with upgraded injectors but stock turboes as well as people running higher than 14psi with stock injectors but upgraded turbo.
which are true
thanx
dan
edit: not ragging on you charles your input is appreciated as well because someone asked me about these things and told me that you were running higher with both inj. and turbo stock still. how do you do it?
Originally posted by dan
ok ive been pondering these claims and ill ask here first to see what people have to say.
ok stock s13 sr20det has 370cc injectors. the stock garrett t-25 is NOT the same as a mitsu t25 obviously since stock dsms can run their t25s up to like 18 or 19psi stock.
now
14psi is the accepted maximum boost level you can run because is it:
a) 370cc injectors max out after 14psi?
b) t25 becomes inefficient at 15psi starts blowing hot air or
c) is it a combination of both?
please clarify this for me because i have heard charles (boosted240) runs more psi on stock turbo and injectors? and i have heard of people running 16psi with upgraded injectors but stock turboes as well as people running higher than 14psi with stock injectors but upgraded turbo.
which are true
thanx
dan
edit: not ragging on you charles your input is appreciated as well because someone asked me about these things and told me that you were running higher with both inj. and turbo stock still. how do you do it?
And yea.... DSM turbos are very easy to get as apposed to the t25 on the SR20DET.
BTW... does anyone know if a T-3 from a z31 turbo will bolt up to the factory SR20DET manifold without any major diffaculties?
Thanks
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Charles, originally "Boosted240"
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03' Silverado 2500HD 6.0L Ext Cab w/Wheelchair access conversion by Ryno Mobility
Thread Starter
Get the fuck off my lawn
Joined: Oct 1983
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thanx man i know jay whitely says that above 14psi it gets inefficient he knows his stuff. ill see if he has anything to say on it do u know about the injectors? and what boost controller are u running??? be careful on that creeping! 
oh here this might help with your needs. the T3 will fit because it utilizes a t25 flange they are the same.
https://www.tamparacing.com/hebb/showthread.php?threadid=16758
oh here this might help with your needs. the T3 will fit because it utilizes a t25 flange they are the same.
https://www.tamparacing.com/hebb/showthread.php?threadid=16758
Craving Boost
Joined: Apr 2001
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I always thought the T-toosmall was the same on DSM and on SR motor. Its the same turbo just for some reason the SR cant hold the boost as well as a 4g63...at least thats what the case appears to be to me.
Heres my experience with the turbo:
15-16psi is as high as you can go on 93 octane gas. Above that it will just blow hot air.
Now go get some 100+ octane gas
crank the boost to like 21-22 (wont hold drops off to about 17) and there is a night and day difference. The turbo will still pull on the top end with better gas. Of course with my AFC I can lean it out with better octane and run alot better.
Basically my car goes from mid to high 14s from a roll on pump gas to low 14s on race gas
Of course DSMs have 450cc injectors stock(5speed) so we can support higher boost easier.
NOt sure how much that will help but just thought Id give you my end.
Oh and you guys are lucky in that you run low 13s with the t25 exhaust and intercooler. Strap on a Forced Performance Big28 and you could reach 11s easy with traction gaskets fuel and the other supporting mods.
Heres my experience with the turbo:
15-16psi is as high as you can go on 93 octane gas. Above that it will just blow hot air.
Now go get some 100+ octane gas
crank the boost to like 21-22 (wont hold drops off to about 17) and there is a night and day difference. The turbo will still pull on the top end with better gas. Of course with my AFC I can lean it out with better octane and run alot better.
Basically my car goes from mid to high 14s from a roll on pump gas to low 14s on race gas
Of course DSMs have 450cc injectors stock(5speed) so we can support higher boost easier.
NOt sure how much that will help but just thought Id give you my end.
Oh and you guys are lucky in that you run low 13s with the t25 exhaust and intercooler. Strap on a Forced Performance Big28 and you could reach 11s easy with traction gaskets fuel and the other supporting mods.
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ok stock s13 sr20det has 370cc injectors.
***Correct.
the stock garrett t-25 is NOT the same as a mitsu t25 obviously since stock dsms can run their t25s up to like 18 or 19psi stock.
***Correct. The Nissan T25 is a Garrett turbo whereas the Mitsubishi T25 is a Mitsubishi turbine housing and wheel and a 55 trim Garrett compressor wheel. The Mitsu T25 uses the standard Mitsu turbine housing which has a round turbine inlet instead of the Garretts rectangular inlet. The Nissan T25 will eventually take a crap aftr extended boosting over 12 psi. This is because of its weaker thrust bearings which cannot handle very much stress. The thrust bearing can be upgraded to a 360 degree Perfect Circle bearing which can support a lot more power.
now
14psi is the accepted maximum boost level you can run because is it:
a) 370cc injectors max out after 14psi?
***No.
b) t25 becomes inefficient at 15psi starts blowing hot air or
***The bearings die over 12 psi. The turbo becomes *very* inefficient over 14-15 psi. This is because the turbine housing is very small and creates a tremendous amount of backpressure in the exhaust manifold. Higher boost pressure will cause reversion which will result in substantial power loss. Another thing is that at higher boost pressures the T25s compressor wheel is spinning on order of 250000 to 300000 RPM which simply whips the air at sonic speeds and heats it up immensely.
c) is it a combination of both?
****The turbo will max out before the injectors and MAF. The stock MAF tops out around 5.1 volts.
Just this morning I had to go help a friend who boosts way too high on his T25. He is blowing white smoke out of the tailpipe now and had to be towed home.
My advice is to stay at 12 psi or lower for the longest turbo life. Also make sure to use a 3 downpipe exhaust and a test pipe.
Peace
***Correct.
the stock garrett t-25 is NOT the same as a mitsu t25 obviously since stock dsms can run their t25s up to like 18 or 19psi stock.
***Correct. The Nissan T25 is a Garrett turbo whereas the Mitsubishi T25 is a Mitsubishi turbine housing and wheel and a 55 trim Garrett compressor wheel. The Mitsu T25 uses the standard Mitsu turbine housing which has a round turbine inlet instead of the Garretts rectangular inlet. The Nissan T25 will eventually take a crap aftr extended boosting over 12 psi. This is because of its weaker thrust bearings which cannot handle very much stress. The thrust bearing can be upgraded to a 360 degree Perfect Circle bearing which can support a lot more power.
now
14psi is the accepted maximum boost level you can run because is it:
a) 370cc injectors max out after 14psi?
***No.
b) t25 becomes inefficient at 15psi starts blowing hot air or
***The bearings die over 12 psi. The turbo becomes *very* inefficient over 14-15 psi. This is because the turbine housing is very small and creates a tremendous amount of backpressure in the exhaust manifold. Higher boost pressure will cause reversion which will result in substantial power loss. Another thing is that at higher boost pressures the T25s compressor wheel is spinning on order of 250000 to 300000 RPM which simply whips the air at sonic speeds and heats it up immensely.
c) is it a combination of both?
****The turbo will max out before the injectors and MAF. The stock MAF tops out around 5.1 volts.
Just this morning I had to go help a friend who boosts way too high on his T25. He is blowing white smoke out of the tailpipe now and had to be towed home.
My advice is to stay at 12 psi or lower for the longest turbo life. Also make sure to use a 3 downpipe exhaust and a test pipe.
Peace
Thread Starter
Get the fuck off my lawn
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thanx jay.
i do plan on using proabably the greddy or blitz or maybe even apexi downpipe along with a custom welded test pipe back 3 exhaust. it really depends how long it takes for my money supply to build up because i might just go straight to upgraded turbo by then but it will depend.
thanx
i do plan on using proabably the greddy or blitz or maybe even apexi downpipe along with a custom welded test pipe back 3 exhaust. it really depends how long it takes for my money supply to build up because i might just go straight to upgraded turbo by then but it will depend.
thanx
Chairborne Ranger
Joined: Nov 2001
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Yea...
I have a custom 3 downpipe w/o a cat going into an Apex i N1 (which i removed the resonator from) so i have a pretty strait flowing exhaust.
Dan... as for the boost controller it is a Home made one thats just like the manual one that Turbonetics sells You know.. the Air Compressor regulators. However i will be putting an AVC-R on as soon as it arrives at my door. (waiting on the guy to ship it). And thanks for the info on the T3.
I have a custom 3 downpipe w/o a cat going into an Apex i N1 (which i removed the resonator from) so i have a pretty strait flowing exhaust.
Dan... as for the boost controller it is a Home made one thats just like the manual one that Turbonetics sells You know.. the Air Compressor regulators. However i will be putting an AVC-R on as soon as it arrives at my door. (waiting on the guy to ship it). And thanks for the info on the T3.
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Charles, originally "Boosted240"
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03' Silverado 2500HD 6.0L Ext Cab w/Wheelchair access conversion by Ryno Mobility
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i do plan on using proabably the greddy or blitz or maybe even apexi downpipe along with a custom welded test pipe back 3 exhaust.
***If you need a high quality test pipe for your SR swap I make them for a very reasonable price. They are about the same price as the ones at Heavy Throttle but they also come ceramic coated and with thicker flanges and all necessary hardware.
***If you need a high quality test pipe for your SR swap I make them for a very reasonable price. They are about the same price as the ones at Heavy Throttle but they also come ceramic coated and with thicker flanges and all necessary hardware.
