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Analyze turbo setup

2709 Views 43 Replies 15 Participants Last post by  Riake, 
V
Going to turbo the LS by the end of the summer '06.

I'm looking to do mid to low 13s in the 1/4mi, nothing special, and I want about 200 LBS of TQ to the wheels. The teg is an LS and I do not want VTEC, so my redline will stay stock.

Check over my idea for a setup if you would, all comments are welcome and appriciated.


*T25/28 Hybrid Turbo w/intcooler
*Internal wastegate @ 7psi
*2.5" through DP/Cat/Exhaust
*Vortec Inline HP FuelPump
*OBD-I and NepTune W/Boost
*Upgrade clutch somehow...
*Motor mount inserts
*LSD mated to LS Tranny

Other stuff to get good times- Short shifter, 16" Slipstreams w/good tires

Reason for T28 choice--
**Spool @ 2K, Peak Spool and TQ @ 6K RPM
**Need to keep A/C & P/S

I searched for T28 and found one thread that said too much heat will be given at redline, but that was for a high revving GSR. My car will still redline at 6.XRPM so I don't think that will be a problem.

Again I'm not looking to upgrade in the future or push more that 7psi on the turbo. This will be the final setup for a few years. Time goal is mid-low 13s, good Auto-X car.

Thanks all, boost with you soon.
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T
what about a blowoff valve, what size intercooler pipes, what size intercooler, what manifold?
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V
Oh yeah...
Greddy BOV, 3.0" IC pipes, and the manifold will be built by a local shop Apex Motorsports Tempe, also installing turbo setup.

The intercooler I have to read up on to see what size. I don't want to go overkill but I need one big enough.

*EDIT--2.5" pipes intercooler, not 3"
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M
What kind of lsd is avalilabe for non-vtec motors?
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Vtec_Sound on Jan/23/06 said:
Oh yeah...
Greddy BOV, 3.0" IC pipes, and the manifold will be built by a local shop Apex Motorsports Tempe, also installing turbo setup.

The intercooler I have to read up on to see what size. I don't want to go overkill but I need one big enough.
Click to expand...
Wow 3.0" ic pipes? That's way too big. Get 2.5 in if you plan on running high boost later on, or 2.25 if you're staying with low boost.
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M
quaife sells there lsds for for the ls tranny and maybe go with a 2.5 downpipe to 3 inch exhaust the rest of the way?
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R
Why is 3 inch to big? There is less pressure drop with 3 inch compared to 2.5 or 2.25. The air also only slows down a little bit. It slows down so little that you wont even feel the difference.
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V
No he's right, I'l go with 2.25" pipes -- not upgrading to more boost later.

Thanks
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S
Riake on Jan/23/06 said:
Why is 3 inch to big? There is less pressure drop with 3 inch compared to 2.5 or 2.25. The air also only slows down a little bit. It slows down so little that you wont even feel the difference.
Click to expand...
You're wrong about that. There is MORE of a pressure drop with bigger piping. Also, the bigger the intercooler, the MORE of a pressure drop. So it's not necessarily good to go with a big intercooler unless you're running a lot of boost.
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T
yea i would get 2.25" but the rest of it sounds good and guys this isnt a debate about intercooler pipe size he just wants ifno on his setup
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V
OK so 2.25 pipes sounds good. Tall, thin, wide intercoller.
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V
ThumpnB18GSR on Jan/23/06 said:
...this isnt a debate about intercooler pipe size he just wants ifno on his setup
Click to expand...
Honestly, I'm beyond help - lol. I need all the info on this I can get. I'm buying it peiece by piece throughout the next 6 months and I need to know EVERYTHING YOU GOT before hand. Thanks in advance.
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Vtec_Sound on Jan/23/06 said:
I need to know EVERYTHING YOU GOT before hand. Thanks in advance.
Click to expand...
Search, Search, not just this site but other honda and forced induction forums. Honda-tech has an 85 page thread going about LS turbo set-ups
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C
Justateg on Jan/23/06 said:
Search, Search, not just this site but other honda and forced induction forums. Honda-tech has an 85 page thread going about LS turbo set-ups
Click to expand...

This is true.

Honda-Tech has many turbo guys.

You have to be careful with what you take off of Honda-Tech, but they have an increible amount of users with turbo experience.

Almost every post in this FI section has been addressed @ honda-tech.
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G
What manifold and downpipe are you planning to run? Are you going with custom or full race or what not?

Although, I don't want to say anything negative about your power goal. I can't really see you reaching that number if you plan to run low boost with a t25, which is a really small turbo to begin with. I've seen a few "mildly" built B18B motors with turbos such as T04e and T28's and they're barely hitting the 200lb mark.

Oh yeah also don't forget about fuel injectors, plan on upgrading to bigger ones.
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C
I make 215whp & 188 ft/lbs tq at 7 psi
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SRH_Integra on Jan/23/06 said:
Quote: Riake on Jan/23/06Why is 3 inch to big? There is less pressure drop with 3 inch compared to 2.5 or 2.25. The air also only slows down a little bit. It slows down so little that you wont even feel the difference.

You're wrong about that. There is MORE of a pressure drop with bigger piping. Also, the bigger the intercooler, the MORE of a pressure drop. So it's not necessarily good to go with a big intercooler unless you're running a lot of boost.
Click to expand...
Actually you are incorrect.... you can't call it a pressure drop or loss. You need to call it a lag in building pressure due to the increased volume in the IC and piping compared to a smaller volume IE: 2.25".

I just wanted to clarify that for everyone.
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tepid1 on Jan/24/06 said:
Quote: SRH_Integra on Jan/23/06Quote: Riake on Jan/23/06Why is 3 inch to big? There is less pressure drop with 3 inch compared to 2.5 or 2.25. The air also only slows down a little bit. It slows down so little that you wont even feel the difference.

You're wrong about that. There is MORE of a pressure drop with bigger piping. Also, the bigger the intercooler, the MORE of a pressure drop. So it's not necessarily good to go with a big intercooler unless you're running a lot of boost.



Actually you are incorrect.... you can't call it a pressure drop or loss. You need to call it a lag in building pressure due to the increased volume in the IC and piping compared to a smaller volume IE: 2.25".

I just wanted to clarify that for everyone.
Click to expand...



Yes, but that is what people are referring to when they call it a pressure drop. Comparing throttle response and lag, etc, to the size of the piping.
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V
OK so 200lbs is a little high - With that turbo, tuning, and bigger injectors my realistic goal is about 170lbs.

I think the turbo will be good for a LS redline of 6.8K. It shouldn't die out, but does anybody have any experience with this turbo?
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R
Intercooling piping size

This will show that 3.0 is better, You cant lie with math, unless it was done wrong, and it wasnt. However, it is off topic now so o well.
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