E30 2.9L Stroker ITBs etc build...

[ForcedFirebird]

Currently live tuning from Fort Lauderdale to Denver! This is such a cool jobber. :)

[mrlucretius]

Ok survived winter and TPS is sorted, drives much nicer with proper AE, need to get ForcedFirebird lined up for a final remote tune session!

[mrlucretius]

It feels pretty beastly. With the RHD ITBs and ForcedFirebird's base tune, the torque increased immensely. I will sort out the TPS issues then hopefully remote tune again in two weeks or so. Stay tuned!

[digger]

good results, must perform alot better that the previously?

[mrlucretius]

Hi People, attempted a remote tune session, only got one iteration down until we realized my TPS signal was all screwed up. Some wiring issue it appears.

However, it is winter in Colorado, first tune is a baseline tune, second tune had some timing pushed up in the 3700 rpm region.

Report 215 peak hp at the wheels, 195 peak wheel torque... With more to come.

Sorry for the crappy image...

[digger]

Well, let's see what the optimized tune will bring.

Also, on the list of things down the road is to rebuild the section between headers and the diff. You can see on page 2 there are v-clamps, so I can pull that section and put another one in.

Any guidance on that reconfigure would be appreciated. The goal is to keep the cat, try to get the drone / noise down, and optimize x-pipe location. May be tough to achieve that but will try at some point.

Digger, how would you configure that section? I can push the rear v-clamps back to get more room, maybe squeeze resonators in there for example.

wait until the final tune is done and see how you like it. essentially it is moving the X-pipe further back to help bottom end. if you are happy with it after the final tune then just leave it. the spanner in the works is your headers as they have much longer primaries than most

[ForcedFirebird]

Actually you have plenty of room reading back. Cut the pipes at the cat, and v-band, and that section can be easily reworked.

Digger has done more analysis on the x-pipes, but I have had luck with them at the CSB with the eBay headers. Basically right up against your cat.

[mrlucretius]

Well, let's see what the optimized tune will bring.

Also, on the list of things down the road is to rebuild the section between headers and the diff. You can see on page 2 there are v-clamps, so I can pull that section and put another one in.

Any guidance on that reconfigure would be appreciated. The goal is to keep the cat, try to get the drone / noise down, and optimize x-pipe location. May be tough to achieve that but will try at some point.

Digger, how would you configure that section? I can push the rear v-clamps back to get more room, maybe squeeze resonators in there for example.

[digger]

You don't think there's enough compression for the cam to pull in lower RPM?

no compression is fine, the exhaust setup is prone to reversion sub 3500/4000rpm

[ForcedFirebird]

You don't think there's enough compression for the cam to pull in lower RPM?

[digger]

well from the engine specs i'd be expecting bigger numbers. id still expect to be pretty cammy kind of delivery almost a dip in the 3000rpm rnage with the exhaust setup. the Uk 3L with 288 had that with RHD itbs and its pretty common

[ForcedFirebird]

much better result, heaps more torque. it would drive a whole lot better than the peak hp difference suggests

the dip at 3700rpm will be in part due to X-pipe location IMO

The dip is because the base timing map I use on strokers pulls timing at ~60-100kpa/3500+RPM, just like the stock ECU. I then use the dyno to increase it until we find MBT. I wouldn't be surprised if there's another 15-20wtq still left on the table. We made 202wtq with a 2.8, 272 cam and lesser 9.4:1 comp. It's always safer IMO to be conservative on the street tunes, then ramp it up - specially when remote tuning.

[digger]

much better result, heaps more torque. it would drive a whole lot better than the peak hp difference suggests

the dip at 3700rpm will be in part due to X-pipe location IMO

[mrlucretius]

[mrlucretius]

Definitely more to be had. The 3500 dip should go away, the low end torque should be taller and flatter (looking at your dyno plots earlier in this thread) and I think there is more hp at the very end, perhaps the peak will lift up more as well. That little uptick near 7k is real we think... What is that?

Ya, I was recommended this shop:

http://dyno-pro.com/

They are about 30 minutes away, have two dynos, been in the business 24 years.

Totally reasonable pricing.

How much time would you (John) need to be satisfied with a final tune? 2-4 hours?

I trust your experience regarding leaner AFRs.... Let's do it!

Perhaps you have time one of the next few Saturdays? Or if needed I can skip a half day of work. Let me know I will schedule something.

We can screw around briefly with Alpha-N as well. However, it really seems to run fine in MAP.

I regret not logging those dyno pulls... I will send you the latest tune. I did some autotuning, and added smoothing to the TPS (which made it behave better for sure).

I think I have spark induced TPS noise still. I am going to reroute a shielded TPS loom sometime.

Thanks,
Alex