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Thread: GTi-r vs. GT28r

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Posts: 41-46 of 46
2012-10-16 15:49:29
#41
On a GT28R I made 290hp 300tq spike 20lbs setteling at around 16-17psi with a DET. I have cams now and and guessing around 320whp. Boost falls hard off at higher rpms though. STI's are a must or some other bigger injector.
2012-10-16 17:01:22
#42
Originally Posted by Boostlee
Originally Posted by totaled200ser
Originally Posted by dganic23
What's the most boost I can safely run on a bone stock de with a t28? Ill be running a 3" dp, 3" exhaust, 50lb msd injectors, and n62 maf. Trying to make as close to 300whp on stock cams as I can.


You need a wideband to monitor the amount of fuel you have but with enough fuel you can run a gti-r to 18-20lbs on race day. I wouldn't run more than 15-16lbs daily and that is only with a great tune and probably larger injectors. The injectors may hold up to 15 psi but without a wideband you won't be sure. Add an external wastegate and you could run more boost safer and make more power


This statement makes no sense!

Injectors are rated for "fuel flow" (or supported HP) NOT "air flow". 15psi out of a T28 IS NOT 15psi out of a GT30R

50lbs are good for a little less than 350 whp at 3bar fuel pressure

MSDs however, do not like to be ran at 4bar fuel pressure


It makes sense to me because he said he was running a gti-r t-28 and msd 50 lb injectors. I assume that since he is running msd injectors he is running at 3bar fuel pressure. Since he specified which turbo and injectors he was running, i gave him an idea what boost level he could run on that setup. I don't understand why what I said makes no sense. Please enlighten me.
Drew
2012-10-16 17:12:46
#43
I have an aem uego to monitor my afr's and the car will be tuned. 300whp is what Im looking to make, so I don't see any issues with using 50lb msd injectors.
2012-10-16 17:25:01
#44
Should be no issue at 300whp with a t28 and 50 lb injectors. You are going to near topping out that turbo so it may take 18lbs or so to get there, it depends on the tune. If you want that turbo to last at 300whp you should look into an external wastegate to keep the temps down.
2012-10-16 17:31:39
#45
@totaled200ser. Go back and read what my post said

Again; what you are saying is incorrect as injectors are not measured by how much psi you can run, but by how much fuel they can flow (vol/min). Your statement is misleading!
2012-10-16 19:01:00
#46
I understand what you are saying and it is totally correct. I was just saying in his situation that I could make an educated guess since I knew the turbo and had a good idea on fuel pressure. I understand that psi on one turbo and psi on another turbo will make different horsepower, we have both been doing this a long time. I guess out of context my statement was in fact not true. Either way I think this guy has gotten enough help to move on with his project..... I hope.
Drew
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