im using cromepro right now...the 2step is set at 7k and i consistantly build 4.7psi off the line...i need more lol!

so i have been reading alot about retarding the timing to increase teh amount of boost being made...

my question is where do i retard the timing?

lets say im looking across the 7k colum in crome do i retard the timing in the boost portion of the map from say....0psi to like 10psi? (i cant remeber exactly what the colum heders are, but you get my drift) since im boosting 25+psi i shouldnt ever be making 10psi at 7k, only when im on the 2step, is what im thinking correct??

and how much is a good amount to retard?? we talking 5 degrees? or like 10-15 or what??

going to the track this friday and i want to test this out! thanks!

 

its not going to work. you are still goin to have to pass throw that part of your map on the way to 20psi. the car will more than likey fall flat on its face with alot of timing missing from it... trust me ive tried that before hehe

 

brets right it very hard to do i have only successfully done it one time but it was mainly due to how the boost swing was that it let it work right.

 

well yea im thinking it would work for me becuse at no point in time am i ever at 7k and making less than 10psi....besides at the launch...as soon as i launch its allways in between 18-25 psi...at least from all my datalogs..

how do other engine mangament systems like neptune or hondata do this? cause i know that AEM is a bit different...

 

Hondata shuts it off after a certain mph has been reached.

 

yeah neptune aem and hondata all shut off the launch limiter after a certain mph. And the retard is a function of the launch limiter, so it never sees the rev retard unless its stopped.

 

ahh i see...so what your saying is im screwed and need to buy an msd basically huh?!

 

i tried what your talking about with turbo edit and i dunno how much boost it builds but it gets off the line a lot better than without retarding the timing...its at -5 degrees around where the 2 step is...without it i dont get full boost till like the end of 2nd gear....doesnt crome pro have a antilag feature?

 

You can switch memory ranges on 27C512/27SF512 by power/grounding pin 1. Moates.net makes an adapter to do just this that makes in-ECU setup a cinch for 35 bones. Figure out how to use clutch switch and op amp slaved to VSS to switch memory locations, or El Redneck it with a pushbutton on steering wheel/shifter. IIRC, there are certain switches that act like a circuit breaker you have to reset to prime again, you may be able to get one of those, prime it, and then arm clutch switch when staging... as soon as you let off it pops and you have to reset it before your next run.

I can't tell you how much timing to yank. It's going to vary with your setup, and you are going to be able to control your boost level with ignition timing. Start playing.

God, you HT n00bs are unimaginative. You do realise Men were building racecars out of whatever they had at hand long before Summit had a catalog for little boys bolt together toys?

 

J. Davis, have you tried flipping the 2Timer with the car running? I have one, haven't bothered to ghetto up two maps yet. Is the flip faster than the ECU accessing the next instruction set?

Now wouldn't it be neat to flip an output from the ECU to ground the 2Timer to chassis to flip to the 2nd map... completely separate launch/track maps, haha!

 

You have to make sure the code is exactly the same as switching complete programs while running = CEL 0. As long as you just alter the mappings, you are golden.

Needs to be high speed relay/reed switch, but people have manually flipped switches in the past fast enough to avoid CEL 0.

 

J.Davis i knew you would have some sort of solution for me!! i have seen teh 2timer and honestly i didnt even think about that...i do like your switch idea and i will look into the circuit breaker type switches...i think that would suit my needs....tonight at teh track im going to play around with timing and the 2 step while im waiting between rounds...see if i can find a good number and if its possible to build more boost....

thanks JD and anyone else feel free to chime in

 

It should also be possible to write a Crome script to do this, now that I think about it.