yusoslo

Well Lately I have been having a boost creep problem in my rx7.I think the wastegate diagphram is torn causing boost to leak past it. So my car is set to be super rich anything above 1 BAR.

So here is the deal.

The car runs great at low boost in any rpm. We have tuned it to a very solid 11.5 AFR across the board. Now this isnt the tunings problem but If i floor the car it hits 8lbs....then boom! 14 then 18psi its rediculous, so the car ends up falling on its face.

I tried to still tune it with the messed up wastegate and modulating the throttle, I held it around 10lbs the best I could. It still seemed to die in the upper RPM range as opposed to 7-8lbs which pulled clean and hard at 11.5:1.

See at 7-8 the car is in the 11.5's

but at 10-14lbs the car is in the low 10's....would low 10's in a rotatry cause I significant power loss? or is it my timing????

My biggest Q is I am using Claudio's base map for my 3bar stock s4 13B on a E6K, and wanted to know if I need to change my timing values. I heard runing stock values in vacuum are great, but in boost I should run a 12 degree split across the boards. I have not looked at the stock maps but I am guessing they do not have this even split I am sure it is more exponential than a even linear seperation. This would then explain the power loss in the upper rpm range since I am exceeding stock acceptable boost values...this may have been a safety feature set into the stock timing maps.

So... should I change my timing split to 12 degrees???
Is a low 10:1 AFR too rich at 10lbs and causing power loss??

I really need to fix my boost issue asap. but........


Does anyone have a 550/gsle (orange top 680cc injectors?) map on a stock T2 with exhaust etc etc?? maybe I could compare

Claudio RX-7

iTrader: (1)

Ok, what fuel are you using? are you running 93 octane or better? Also, i will confes those trailing split values are borrowed from the HITman, since back then i was a little green with trailing split theory, but technically, split should increase a little as RPMs clime. But depending on who you talk to, you will get different theories and phylosophies.

As for your AFRs being below 12's, ive noticed that on 93 octane, you can get away with better power around that.

11.5-12 is what i have seen, specially on ported rotaries with big turbos and big injectors.

Also, on the general timing maps on there, they are somewhat conservative, so you can probably make more power if you raise them a couple of degrees to see what you get. i did an FD with E11 once, and that put down 390hp @ 17psi using the haltech as boost controller, and 93 octane fuel, it started braking up because the plugs were bad so we didnt push it further.

yusoslo

well I will play with the timing tonite to see whats up.

So you agree the stock timing is a bit safe, I want to work with the split before I mess with the advancement of the timing right now.

I am using 93 octane with the aforementioned injectors and a walboro pump.

It seems low 10's which is what I am at around 10psi is way too rich so I need to correct that, but wont untill I get the boost problem resolved.

Claudio do you have a 550/680 or 55/720 map that has been well tuned as far as upper boost levels and timing adjustments so I can compare.

As I stated before I think stock maps rise too quickly on the base fuel maps around 8psi and greater. I have slowly lowered them and have gotten my AFR #'s looking better.

yusoslo

Ok so I looked at some maps in haltech. My map which is a stock one with altered fuel tables has trailing timing split starting at 3-4 and goes up to 8-10 as it approaches 15psi. This is on the stock claudio map.

Now I also looked at a map of a t04 turbo rx7 with 550/1600 and it had very low split values around 4 starting off and ending around 8.

Now when some people mentioned raising my split level to around 10-12 as soon as it goes into boost and cary that across, wouldnt that make me loose power???

Im trying to see why my car is falling on its face at high boost, minus the fact I am overboostingand dumping fuel in like crazy.

Indian

iTrader: (1)

Bro, I dont want to sound like a ***** or anything, but dont you think you should resolve the boost issue before you tackle another? That way you can definetly approach the "losing" of power issue.
I know I didnt answer your problem, but you can look at it as "part of the solution"

Keith

slo

iTrader: (1)

Sorry to thread jack but what kind of turbo (talking to claudio)?

As far as the boost goes verify that you have the wastegate hooked up to a port thats seeing boost. Then try carefully blowing some air into it with a compressor. Lastly if you have a stock turbo with a huge exhaust and an unported wastegate, port your wastegate or add a restrictor, to the exhaust. Oh and BTW if you have a boost controller hooked up bypass it.