:::RHMT::: Real Home Made Turbo

General Category => Engine Management => Topic started by: TheMadScientist on December 29, 2009, 04:35:34 AM

Title: Please help Z6 warm start problem with crome
Post by: TheMadScientist on December 29, 2009, 04:35:34 AM
It's a z6 with eagle rods, vitara pistons, precision 780cc injectors, a gm 3 bar map sensor, a scirroco radiator, and a plx m-300 wideband.
Used crome to make a basemap and the car started right up. AFR's are between 13.8 and 14.9 at idle around 700-1100 rpms. When the car gets warm and you shut it down it won't start again. The wideband is in the stock exhaust manifold. When you shut the car down with the car off the wideband reads 11.6-12.0. Not really sure of the problem.
The car has never been driven on these injectors and this map sensor. Just installed them. Had no problems with the stock injectors and the stock map sensor.
Title: Re: Please help Z6 warm start problem with crome
Post by: 92CXyD on December 29, 2009, 10:16:08 AM
I'm using the 75# Delphi Inj. (788cc @43.5psi) and 3-bar modified stock map sensor. My engine has Vitaras and TT rods.

So a very similar setup.

I have my offset at 65 and cranking at .600 and it seems to work well after warm up. :yes:

Title: Re: Please help Z6 warm start problem with crome
Post by: TheMadScientist on December 29, 2009, 01:12:36 PM
Where do I change those settings in crome I can't find them?
Those are the exact same injectors actually precision injectors are made by delphi,
Title: Re: Please help Z6 warm start problem with crome
Post by: 92CXyD on December 29, 2009, 01:32:52 PM
Where do I change those settings in crome I can't find them?
Those are the exact same injectors actually precision injectors are made by delphi,

using Crome 1.5.3

Make sure you have the Inj. Tools activated from plugins
Goto Multiplier Calculator button
Then goto  Advance tab
Then enter your offset right beside the scalar to final multiplier
Then go done to cranking and enter the desired value.   

I use 65 for offset and 0.6 for cranking but, I know some people us 60 for the offset for exact same inj.

Title: Re: Please help Z6 warm start problem with crome
Post by: ryan89crx on December 29, 2009, 01:53:07 PM
Where do I change those settings in crome I can't find them?
Those are the exact same injectors actually precision injectors are made by delphi,

using Crome 1.5.3

Make sure you have the Inj. Tools activated from plugins
Goto Multiplier Calculator button
Then goto  Advance tab
Then enter your offset right beside the scalar to final multiplier
Then go done to cranking and enter the desired value.   

I use 65 for offset and 0.6 for cranking but, I know some people us 60 for the offset for exact same inj.


You using Pro with Gold rom?
Title: Re: Please help Z6 warm start problem with crome
Post by: TheMadScientist on December 29, 2009, 02:03:55 PM
cool cool that's what I thought. My offset was at 0.00 .
Did you change the injector battery offset at all?
Title: Re: Please help Z6 warm start problem with crome
Post by: 92CXyD on December 29, 2009, 02:11:59 PM
cool cool that's what I thought. My offset was at 0.00 .
Did you change the injector battery offset at all?

No
Title: Re: Please help Z6 warm start problem with crome
Post by: Joseph Davis on December 30, 2009, 12:00:37 AM
I use 65 for offset and 0.6 for cranking but, I know some people us 60 for the offset for exact same inj.

If you have inline resistors instead of a resistor box (10 ohms vs 6.8 ohms), if your fuel pressure is different from stock, etc, all of these things affect offset - which is an quick and easy expression of battery compensation, anyway.
Title: Re: Please help Z6 warm start problem with crome
Post by: 92CXyD on December 30, 2009, 12:31:55 AM
I have a resistor box off of a '91 EF and I use the stock fuel reg. ;D
Title: Re: Please help Z6 warm start problem with crome
Post by: DmC on January 02, 2010, 02:58:53 AM
I have a resistor box off of a '91 EF and I use the stock fuel reg. ;D
I knew I liked you. aftermarket fuel pressure regulators can cause a lot of unnecessary drama.
Title: Re: Please help Z6 warm start problem with crome
Post by: 92CXyD on January 02, 2010, 12:23:31 PM
I have a resistor box off of a '91 EF and I use the stock fuel reg. ;D
I knew I liked you. aftermarket fuel pressure regulators can cause a lot of unnecessary drama.

Yeah I'm a cheap bastard and I read about people having shitty luck with after market reg.

Now I got to get the fuel pumps figured out. I have been risking some serious harm to my engine running on a stock pump with 200k+ miles on it. ;D
Title: Re: Please help Z6 warm start problem with crome
Post by: HiProfile on January 03, 2010, 02:22:42 AM
cool cool that's what I thought. My offset was at 0.00 .
Did you change the injector battery offset at all?

The problem you'll face is you'll probably have to change 2 settings if cold start is fine ATM. I'd start at changing cold ect multi (to keep cold start) inversely proportionate to the change made to cranking value (to help warm start). That's after you nail warm start, however.