BEGI S4, GT2860RS, 3" Exhaust - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-26-2008, 05:48 PM   #1
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Default BEGI S4, GT2860RS, 3" Exhaust

Tim tuned an '03 S4 with a 3" exhaust today. The car's set up: GT2860RS Internally gated, IC #2, 2.75" Downpipe, 3" Mid pipe (no cat), and 3" Left Exit Exhaust. Other mods are minor and of no consequence, oil catch can, powder coating etc... Owner is going the forged internal route this summer, so we tuned for 13 psi as requested.

Results: 272.46 rwhp, 235.50 ft-lbs. @ 13 psi. Correction factor: STD 1.03 as calculated by the weather station.

Best numbers done with the Xede unit on a Miata so far.
Stephanie
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BEGI S4, GT2860RS, 3" Exhaust-begi_03_s4_xede_kockcopy.jpg  
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Old 03-26-2008, 05:56 PM   #2
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Best numbers done with the Xede unit on a Miata so far.
Stephanie
maybe run it to redline next time and beat those numbers
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Old 03-26-2008, 06:10 PM   #3
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94 < 2000 lbs w/99 motor @ ~14psi , 271hp-235ft/lbs, GT2560R with AbsurdFlow© tubular manifold/intercooler piping/3" stainless turbo-back exhaust
Interesting how similar the power is. So how is Paul's car making as much power with a smaller turbo at similar boost level? And doesn't the 03 have higher compression than the 99?

No bashing, but serious questions. Is it engine managment? Manifold design? Am I missing something?

Nice numbers, that must be insane to drive.
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Old 03-26-2008, 06:41 PM   #4
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Hi Stephanie,

Did you guy do any pulls with the standard map in the Xede? If so, please post them. I would like to see the difference Dyno tuning makes.

Daryl
(any news?)
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Old 03-26-2008, 07:00 PM   #5
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nice.
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Old 03-26-2008, 07:07 PM   #6
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Stephanie,

I'd love to see runs made with a similar system on a 94! Hopefully a black one with a hard top and snow tires.

Casey
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Old 03-26-2008, 07:08 PM   #7
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Wow, nice numbers. Better than I'd expect! I should be tuning my car... :-(
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Old 03-26-2008, 07:08 PM   #8
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Sam-03's have lower comp. than 99's and also, pauls maps are very aggressive on timing
paul also has a 3" DP vs 2.75" and its more straight compared to BEGi's IIRC
id like to see the S4 with a MS dyno tuned and then look at the numbers
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Old 03-26-2008, 07:16 PM   #9
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Sam-03's have lower comp. than 99's and also, pauls maps are very aggressive on timing
paul also has a 3" DP vs 2.75" and its more straight compared to BEGi's IIRC
id like to see the S4 with a MS dyno tuned and then look at the numbers
I'm pretty sure the '03 had 10:1 where the 99 had 9.5:1. I'm not Sam by the way
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Old 03-26-2008, 07:25 PM   #10
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Zabac,

You might get your wish when they finish my car. My 94 is down there as a mule. They're installing the S4 system and should be doing testing/ tuning any time now. (I hope!)
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Old 03-26-2008, 07:25 PM   #11
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I believe the 03 has higher CR also.

Maybe this persons CR is lower because he modded it??
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Old 03-26-2008, 07:27 PM   #12
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Zabac,

You might get your wish when they finish my car. My 94 is down there as a mule. They're installing the S4 system and should be doing testing/ tuning any time now. (I hope!)
I'll be happy to see that. I'm going to get an S3, GT2860RS, 3" from dp to bumper, MSPNP, RX7 550's.

C
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Old 03-26-2008, 07:29 PM   #13
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****, your right JAY (sovvy)
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Old 03-26-2008, 07:48 PM   #14
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damn it! beat me by 1 HP!!! but I weigh ~400 lbs less. Anyway, I was thinking my torque is kinda low at 235 for 271hp but I see you made the same. Should the torque be a lil closer to the HP max or is that typical?
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Old 03-26-2008, 07:50 PM   #15
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hey steph, can you post the DRF file so i can directly compare my 2560 setup to it easily?
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Old 03-26-2008, 10:13 PM   #16
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Tim was supposed to copy files for me. I will check and see if he did.

Quote:
Should the torque be a lil closer to the HP max or is that typical?
Corky says that is typical. Due to the pressure losses and/or drag in the system (If i am understanding correctly!). In order to get more torque we would need to increase flow (bigger TB, less drag thru IC, less drag thru filter, etc.) and increase the boost levels.
Stephanie

p.s. 1 less psi too.
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Old 03-26-2008, 10:17 PM   #17
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oh yeah.....well mine only made 10rwtq less at 6k than yours on my little 1.6L at the same boost.
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Old 03-26-2008, 10:23 PM   #18
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Quote:
Originally Posted by Stephanie Turner View Post

Corky says that is typical. Due to the pressure losses and/or drag in the system (If i am understanding correctly!). In order to get more torque we would need to increase flow (bigger TB, less drag thru IC, less drag thru filter, etc.) and increase the boost levels.
Stephanie

p.s. 1 less psi too.
paul, i guess that means we gotta put on that new intake manifold and mustang TB before dyno day...
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Old 03-27-2008, 12:01 AM   #19
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I'll be happy to see that. I'm going to get an S3, GT2860RS, 3" from dp to bumper, MSPNP, RX7 550's.

C

Me too. I basically have the same setup as Chris already in my 96 except I got a used S5 with a T3 turbo and 3" Enthuza exhaust (no cat ), AEM and 550 injectors so I've been waiting to read your impressions when you get your kit.
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Old 03-27-2008, 10:09 AM   #20
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Looks good Steph/Tim/Begi! With an Xede too, very nice. I too would like to see Paul's 2560 plot overlaid on this 2860RS plot to see how much later, if any the 2860rs spools. You guys are kinda close to sea level, right?

I think you guys should drive up to delaware next weekend for the dyno day too.

Last edited by TurboTim; 03-27-2008 at 10:31 AM. Reason: oops, put 2560RS instead of 2860RS, duh
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