GT2871R Dyno results question?

[sli240sx]

hello everyone, just wanted to see your opinion on the new turbo. I installed the new turbo yesterday and got a reading of 299 whp with 227ft-lb at 14.4 psi on a mustang dynamometer. The only problem is that i reach that number at 7400 rpm. Is that normal or what? I see other result much higher than that. The guy at the shop just tell me the that turbo has a lot of lag. I don't think that turbo I have has that much lag. My set up is a tomie exhaust manifold, greddy elbow, 3" downpipe and exhaust, z32 air mass with greddy intake, apexi power fc, hks evc VI, nismo 740cc injectors, front mount intercoller, atmosheric bov, new clutch and flywheel, and the GT2871R. Another thing is that i cant turn down the boost. I have the evc 6 controller and i cant do anything with it. I cant even turn it up is i wanted to. I can physicaly change the numbers but my boost gauge stay the same at 14 or 15 psi at 7400 rpm. If anybody can give me some advice that would be great. I'm thinking that my boost controller is not connected right. I dont know.

[supreamS14]

64 a/r or 86 a/r , what intercooler and how big are your hot and cold pipes? Don't mustang dynamometer's give numbers a lil lower? I think you should have more ft. Lb's! Maby you just needs some cams to open the mid-range.

[S14toRPS13]

Mustang dyno's are known to read lower. I'm running a smaller turbo, GT2530. My motor put out 270 whp @ 17 psi. As far as your turbo lag, where do you hit full boost?

The only thing I can think of about your boost problem is that you might not have hooked it up right.

[sli240sx]

thats the problem i don't hit full boost at all. It just keeps climing untill redline!

[DrifterProdigy85]

Post up the dyno graph. I think your numbers are awesome. 300whp @ 14psi is pretty good. Im guessing your tq curve is fairly flat which is why your peak power is at redline.

[blacksrjdm]

thats the problem i don't hit full boost at all. It just keeps climing untill redline!

check your vaccum lines and intercooler piping for leaks, but if it just climbs the whole time u probably have a vaccum leak. I have a similar setup. Megan Mani, gt2871r .86 a/r, outlet pipe exhaust etc. When I first installed the turbo would climb the boost to redline and I checked my vaccum lines and the catch can wasnt attached properly. Boost 17lbs at about 3600 rpms. Hold on to your *** when it boosts.

[DrifterProdigy85]

Mine hits about 18psi @ 4krpm in 5th gear. lol. Thats with Greddy IM and Tomei 270 Cams though. Ive never been able to get 18psi below 4krpm though even when i had stock IM and 264 cams.

[srdub-t]

what springs you running wit those cams? how do they sound at idle? how do you like em? im buying same ones

[sli240sx]

yeah ok ill check the vaccum lines but what is the catch can? is that the acuator. I'm going to take it back to where i had it installed. I hope they find something wrong. I tried to post the dyno chart but i couldn't find out how. I know that i'm suppose to reach max boost at around 3800 rpm but the shop told me that that turbo just lags! And another thing is that the EVC contorller is giving me wrong kpa readings. It tells me, when i floor it that im making 150kpa which is wrong my boost gauge only goes to about 15psi then i have to change gears. I think my boost gauge is giving me the right reading because when i dynoed it the max boost I got is 14.4psi. Which is another thing, I don't even think they set my boost at all. Sometimes when i really push it my boost goes over 14.4. So what the hell is that? It can't be set to a specific point if its doing that.

[S14toRPS13]

Don't the boost controller have a feature where it allows you to control how fast or slow you want the boost to come on?

[sli240sx]

I don't know I think i tried everything you can possibly change. do you think it could be the bov? maybe i have to adjust it. I'm going to try that tomorrow.

[blacksrjdm]

Mine hits about 18psi @ 4krpm in 5th gear. lol. Thats with Greddy IM and Tomei 270 Cams though. Ive never been able to get 18psi below 4krpm though even when i had stock IM and 264 cams.

It should spool alot later if it is a gt37r. Great for making alot of power what kind of hp number u making.

[DrifterProdigy85]

Im talking my 2871R .86 i have.

[S14toRPS13]

I don't know I think i tried everything you can possibly change. do you think it could be the bov? maybe i have to adjust it. I'm going to try that tomorrow.

Your BOV could be leaking under boost. Hopefully that'll work out for you.

[codyace]

Almost hard to tell without a dyno graph

On a mustang dyno, numbers are typically lower than those on a dynojet. On a DJ you probably made in the 320-330 hp and 260/270 ft lb range....which seems about right with the stock cams in there.

[sli240sx]

yeah i fixed the problem it was all in the boost controller. It was holding my boost back. The shop just didn't set it properly. now i'm getting 15psi at around 3800 rpm!! yeah!!