94 GT Vs Cobra tunes

TT331FB · 04-02-2007, 08:48 AM

Hi wise ones!

I'm comparing the tunes and what I see is the MAF is almost the same. The injectors are different, 19 vs 24 . The big difference is the injector offset vs voltage. It seems to me, this is how Ford matched the 24# injectors to the standard MAF used for both cars. I have seen published offset tables, for the 24# injectors and they were from the Cobra which are not typical due to the MAF not being calibrated for the injector size.

I don't see any big differences in the tune A/F tables except the Cobra tune is a little fatter and the GT tune has a little more timing. The Cobra tune uses the same number for high/low injector slope.

I'm thinking I will start with the GT tune and build from there. I don't see any advantages to using the Cobra tune.

I run a C&L, 73 MM with Orange tube, 24#. I'm thinking I will just ratio up the flow numbers for the stock MAF curve, new value = old *24/19 for a starting point. I see someone has posted a ProM flowed 73 MM 24# C&L but they didn't identify the cal tube that was used. C&L doesn't use the same tube for every 24# application.

Comments?

Thank,
Eric

04-02-2007, 08:48 AM	#1
TT331FB Member Join Date: Aug 2005 Posts: 53	94 GT Vs Cobra tunes Hi wise ones! I'm comparing the tunes and what I see is the MAF is almost the same. The injectors are different, 19 vs 24 . The big difference is the injector offset vs voltage. It seems to me, this is how Ford matched the 24# injectors to the standard MAF used for both cars. I have seen published offset tables, for the 24# injectors and they were from the Cobra which are not typical due to the MAF not being calibrated for the injector size. I don't see any big differences in the tune A/F tables except the Cobra tune is a little fatter and the GT tune has a little more timing. The Cobra tune uses the same number for high/low injector slope. I'm thinking I will start with the GT tune and build from there. I don't see any advantages to using the Cobra tune. I run a C&L, 73 MM with Orange tube, 24#. I'm thinking I will just ratio up the flow numbers for the stock MAF curve, new value = old *24/19 for a starting point. I see someone has posted a ProM flowed 73 MM 24# C&L but they didn't identify the cal tube that was used. C&L doesn't use the same tube for every 24# application. Comments? Thank, Eric __________________ TT331FB - T3/.6/.63 turbos, Spearco intercooler, 302/331 Mexican Block,AFR 185 heads, 80mm MAF, 75mm TB, 50# injectors, Tweecer, Track Heat intake, Comp cams roller blower grind, MSD BTM, DIY-WB, Yokogawa video display,T-56 tranny, 9" 3.5:1 Traclock, 4x disk brakes, TCP most everything, shelby roll bar. First fire up 2/14/2004.