[djfourmoney]

This not a street tire or stock tune question. At now four different tracks I have trapped 97-99 mph with the highest gain between the 1/8th and the 1/4 mile being 20.65 mph. It seems to me my car should gain 20-21 mph. But it doesn't seem to matter how fast I run in the 1/8th mile, I still end up with 98-99 trap speed.

I am under the impression that an E30 tuned car should trap around 103 mph, it shouldn't matter if I do the 1/8 at 78, 79 or 80 mph the car should always the same gain.

My car even heat soaked should run 100 mph trap all day.

Shifting at 6,000 seems to work but so does shifting 1-2 at 6000, the rest 5500.

I launch between 4500-4800 depending on track conditions.

This past Wed was best DA to date. My ET were all personal best, but trap remained the same; I'm sure the car would have run 101-103 after being cooled for over an hour but I missed 4th but still went [email protected] mph.

Just trying to see if my car is making the power it should as removing weight is max around 1-1.5 mph increase for all the seats + spare/tool/jack.

Thanks

 

[CaliJoe]

This not a street tire or stock tune question. At now four different tracks I have trapped 97-99 mph with the highest gain between the 1/8th and the 1/4 mile being 20.65 mph. It seems to me my car should gain 20-21 mph. But it doesn't seem to matter how fast I run in the 1/8th mile, I still end up with 98-99 trap speed.

I am under the impression that an E30 tuned car should trap around 103 mph, it shouldn't matter if I do the 1/8 at 78, 79 or 80 mph the car should always the same gain.

My car even heat soaked should run 100 mph trap all day.

Shifting at 6,000 seems to work but so does shifting 1-2 at 6000, the rest 5500.

I launch between 4500-4800 depending on track conditions.

This past Wed was best DA to date. My ET were all personal best, but trap remained the same; I'm sure the car would have run 101-103 after being cooled for over an hour but I missed 4th but still went [email protected] mph.

Just trying to see if my car is making the power it should as removing weight is max around 1-1.5 mph increase for all the seats + spare/tool/jack.

Thanks

What does your RPM drop to after a shift from 6000, you may need to adjust your shift point to get max torque for the next gear. And then again you may be getting all you can out of it without doing a gear change. Nice 60's BTW

 

[djfourmoney]

Thanks for the reply.

I am moving my shift points up because the power band has been extended with my tune. How much remains to be seen, I am going to start at 6500 rpm and work my way down.

Hope to try different points again soon, doubtful I'll be able to hit street legals at Fontana on Saturday.

 

[Fsvt713]

stock intercooler?

 

[djfourmoney]

stock intercooler?

Yes

Only modifications are -

E30 Tune (first time out) [email protected] *left ESC on (need it off to do a burnout)
AEM WMI (500 cc pre-turbo) [email protected] on same tune as above, no adjustment
E30 Tune with E37 in the tank [email protected] (right off the freeway)
E47 Tune (adjustment by Torrie) [email protected] on the forth of 4 virtually back to back runs (20 mins or less between runs) *Missed 4th on first past ended up being [email protected] but it ran 8.56 in the 1/8th which equates to [email protected]

There's more in the tune...

M&H 26x8.5x17 Slicks (1st gear burnout), cold psi 12-13, launch RPM 4500 rpm.

I've only pulled the spare and ran it that way. My fastest past I didn't even remove the spare...

Last time out I pulled the seats but stripped a lug nut and didn't run. But instead of that I am going to try shifting higher since my power band extended all the way to about 6800 rpm.

 

[BlackT5]

I have a pretty good feeling that between 5500-6000 is going to be right. Time your upshift to get you right right before peak torque. Use the meat of the torque curve.

Another thing you can try is get a garden sprayer and wet the intercooler before the run. I can tell you with certainty your charge temps are going sky high by the end of third gear.

 

[djfourmoney]

I have a pretty good feeling that between 5500-6000 is going to be right. Time your upshift to get you right right before peak torque. Use the meat of the torque curve.

Another thing you can try is get a garden sprayer and wet the intercooler before the run. I can tell you with certainty your charge temps are going sky high by the end of third gear.

Heat soak is not an issue with water injection. I am not using it currently, I am working on my E30 now E40 tune. We're going to go more aggressive on the timing next time out.

The car is slowing down because of coolant temperatures not heat soak of the inter-cooler. Inlet temps are high but not high enough to be a concern and going forward I will be using WMI exclusively.

Shifting around 6,000 either at 5500-5600 or 6,000 the whole way I get the above results. My dyno graph says I make the same power at 5500 as I do at 6800 and only then does it drop off but it's still 15 hp higher than stock past that.

Seems to me shifting later in all gears but 3-4 the car will run faster. I didn't try this weekend because I couldn't get the drag radials I wanted in time. I want to find out, so I will go to Street Tuner at Famoso on the 23rd to do just that; I have to come back to LA for work but I'll be driving right back up on Sunday to run Import Face-off @ Famoso (24th).

 

[CaliJoe]

I have a pretty good feeling that between 5500-6000 is going to be right. Time your upshift to get you right right before peak torque. Use the meat of the torque curve.

^^^ This, I was thinking the same thing after reading your post about shifting at a higher RPM. It's all about acceleration and staying in the torque curve, once you get out of it you're not really accelerating like you should, so maybe shifting at a lower RPM will keep you in the curve, and let your HP carry you out the back door. If you have a dyno sheet you can get a pretty good idea where to shift.

 

[Fsvt713]

i also think running an aftermarket intercooler will benefit you even with WMI. Charge air temps really climb hard after 2nd gear as the stock intercooler is a joke. If you start off with lower charge temps and add the WMI its going to help out.

 

[djfourmoney]

I don't believe the IC needs updating and that's all I'll say about it.

 

[djfourmoney]

CMI Fall Fling Final event of the year, new PB trap speed

First pass, broke the throttle pedal. Lucky my best friend showed up this weekend as he used to live in Sacramento, now living in Manteca. He was johnny on the spot with an idea how to repair it and fixed it in about an hour.

That turned out be fortuitous as it started to sprinkle as a cell rolled through.

It stopped raining right as we're about to put the repaired pedal back on the car.

I trusted his repair enough to make a pass, new PB trap speed = [email protected]

21.6 mph matches my previous best between the 1/8th and the 1/4. It was 1.52 mph faster than my next fastest pass which also happen about 30 mins later. (100.44)

I did make a change from the last time out but I'm keeping that under my hat for the moment.

There's for sure a 13.3 in it