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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 02-05-2014, 07:26 AM   #29
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Originally Posted by Sportsguy83 View Post
My car is hitting full boost at 4300 RPMs (10.5 psi)
Dyno?

Not that I don't believe you. Just want to see it.
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Old 02-05-2014, 07:31 AM   #30
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Quote:
Originally Posted by diss7 View Post
Dyno?

Not that I don't believe you. Just want to see it.
No problem, I know where you are coming from

Boost plot here: http://www.ft86club.com/forums/showp...postcount=1707

Dyno here (it's a work in progress, but we ran out of time on the Dyno, DISREGARD AFR, was off by more than a point): http://www.ft86club.com/forums/showp...postcount=1701
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Old 02-05-2014, 07:45 AM   #31
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Hmm interesting.

Based on the dyno, I'd say you're not making full boost till 4800, as that's when peak torque is basically reached. Say max boost was reached at 4300, then I can't see why torque would continue to climb between 4300-4800, if boost stayed constant.
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Old 02-05-2014, 07:50 AM   #32
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Originally Posted by diss7 View Post
Hmm interesting.

Based on the dyno, I'd say you're not making full boost till 4800, as that's when peak torque is basically reached. Say max boost was reached at 4300, then I can't see why torque would continue to climb between 4300-4800, if boost stayed constant.
I am counting full boos the moment I go over 10.15 which is the WG spring pressure. That moment is 43XX. I guess boost is not staying constantly at 10.15 and that is why torque climbs up a bit more.

But still, even if it were 4800, it is not 5500 either. I will look at the log again and see if I can point out why 4300 not 4800.

Edit: @diss7

I will also add that the moment where you reach max torque does not automatically means it hits full boost there. There are different tuning strategies and one of them is to ease the torque hit via cam timing, and ignition timing and that peak torque can be phased to a different point than the first hit of full boost.
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Old 02-05-2014, 07:55 AM   #33
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Agree 4800 is better than the 5500 I was stating. Can't recall who's dyno I saw around 5500, must have been ptuning, but I think they're gt3076r, not gtx. Which would account for the difference between 4800 and 5500
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Old 02-05-2014, 08:01 AM   #34
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Full boost is reached at 43XX and 44XX in both. I believe the matter of reaching full torque later is a matter of tuning. I've seen JR tunes with a GTX28 where torque peak is at over 5K, where he explained specifically he delayed the torque hit to make it a smooth progression and being easier on the motor.

.82 Backhousing

Looking at Log one

4085 7.34
4117 7.92
4163 8.355
4213 8.79
4277 9.66
4319 9.66
4322 10.095
4424 9.805
4442 10.385
4512 10.24
4585 10.095
4614 9.66
4712 9.805
4734 10.095
4870 10.385
4868 10.53
4970 10.53

Second log:

4109 6.76
4119 7.195
4135 7.195
4193 7.63
4231 8.5
4314 9.08
4354 9.66
4436 9.805
4444 10.385
4471 10.095
4540 10.095
4622 10.095
4640 9.805
4672 9.95
4765 10.24
4819 10.53
4874 10.24

Last edited by Sportsguy83; 02-05-2014 at 06:46 PM.
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Old 02-05-2014, 08:39 AM   #35
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It really depends what your full/target boost is.
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Old 02-05-2014, 08:45 AM   #36
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It really depends what your full/target boost is.
Very true. full boost targeting 10 psi will be reached at a different RPM than 20 psi.
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Old 02-05-2014, 03:39 PM   #37
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Yep that's where it's hard to compare numbers as well. People running these turbos on EJs and SR20s, etc. are generally running at least 18psi or so on a GT30 series turbo, most times more than that because they are looking to make 400+ WHP. Those looking to make 300-350WHP are usually using the GT28 series stuff since it accomplishes their goals with the least amount of lag.

It's difficult on this motor with the 12.5:1 CR. It can help mask some of the lag and if you are willing to deal with a little more lag you can make the power on a GT30 with a lot less heat than the smaller turbos by running less boost.
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Old 02-05-2014, 05:39 PM   #38
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I can't wait to get my gtx2863r on and get some comparisons. From the performance above of a gtx30, my turbo is going to be awesome as a daily / track hack.

Edit - I'm hoping for ~250ft/lbs from 10psi, from 3500 (or less ) to 7000rpm. If it starts to taper at 7000rpm, then I can live with that. Although I think the gtx2867r graphs I am seeing this on, are more a reflection of the gtx28 0.63 turbine housing becoming restrictive. I am hoping my 0.86 with 3" exhaust (with no cats or mufflers) will help/solve this issue. Its got to be the turbine, the compressor (even the 63r) can provide the airflow, somewhat efficiently at 7500rpm. Its certainly very efficient up untill 7000rpm.

Last edited by diss7; 02-05-2014 at 05:55 PM.
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Old 02-05-2014, 06:45 PM   #39
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Quote:
Originally Posted by diss7 View Post
I can't wait to get my gtx2863r on and get some comparisons. From the performance above of a gtx30, my turbo is going to be awesome as a daily / track hack.

Edit - I'm hoping for ~250ft/lbs from 10psi, from 3500 (or less ) to 7000rpm. If it starts to taper at 7000rpm, then I can live with that. Although I think the gtx2867r graphs I am seeing this on, are more a reflection of the gtx28 0.63 turbine housing becoming restrictive. I am hoping my 0.86 with 3" exhaust (with no cats or mufflers) will help/solve this issue. Its got to be the turbine, the compressor (even the 63r) can provide the airflow, somewhat efficiently at 7500rpm. Its certainly very efficient up untill 7000rpm.
Important to note that my backhousing is .82. The .63 would spool faster.
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Old 02-05-2014, 07:17 PM   #40
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Much impress. wow.
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Old 02-05-2014, 07:20 PM   #41
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Originally Posted by Sportsguy83 View Post
Important to note that my backhousing is .82. The .63 would spool faster.
i'll hopefully have boost readings and dyno graphs of my .63 in 3 weeks give or take if all goes well
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Old 02-05-2014, 07:52 PM   #42
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Im pretty sure I have the GTX2867R with methanol injection, full 3" catless exhaust and my car is being tuned presently. I hope by next week sometime for it to be done.


I'm hoping over time to get it fine tuned and show some good numbers.

I'll post graphs when I get them.
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