The 350 IM on an auto...

[bunk22]

....I know there is a big thread on this so if it needs to be moved, so be it. For now, I don't run my car like I used to race my C6. But I thought it was time to go for the GT350 on my 6-speed auto with the tuning available.

My mods are JLT, GT 350 IM, 1 3/4" long-tubes, x-pipe with no cats and the local Rick Fast tune; my car came with 3.55 gears. My goal, requirement if you will, was no large loss of low end torque and no surging. Rick said there is some surging if I get on it hard but it actually barely noticeable. The dyno shows loss of low end torque but again, my butt-dyno didn't notice it. No E85 tune as of yet but that will be next.

It's nice that my tuner's shop is 5 miles from my shop and he will work with the car over time with issues or simply fine tuning the tune. Now as far as the dyno, I think it's a dyno jet. I've had 4 Mustangs now and a C6 and I've never seen this exactly format. Lots of curves in the graph and he doesn't use a fan to help cool the motor or simulate airflow. Regardless, it's for tuning, so I get that. The numbers are SAE corrected. I know he doesn't dyno in 5th gear on the stangs so I don't know what gear he went to on my auto.



This was a dyno after my long-tubes against the new 350 IM, some loss in low end torque from 4000-4500 rpm...

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[Terminator2]

Stock or GT350 throttle body?

 

[bunk22]

Stock or GT350 throttle body?

Oh yes, that's a big deal, stock TB. I just got the spacer so the stock one would work. I just drove it around, no surging that I could tell and believe me, I'm so freaking picky when it comes to that.

 

[Taneras]

I haven't seen a lot of GT350 mani dynos, but is that relatively flat horsepower reading from 6300 to 7500 normal? I thought it gained more and more the higher it rev'd. Maybe there's some elevation there, but it does look pretty flat.

 

[Zodiac]

I haven't seen a lot of GT350 mani dynos, but is that relatively flat horsepower reading from 6300 to 7500 normal? I thought it gained more and more the higher it rev'd. Maybe there's some elevation there, but it does look pretty flat.

I'll dig mine out and upload it when I get a chance.

 

[09jsw]

Fbo 93 oct

 

[armykyle1 [HACKED ACCOUNT]

I'm sure with more tuning, that low end loss can be more minimized.

 

[Terminator2]

Fbo 93 oct

Nice would be about 470whp and 410wtrq on E-85.

 

[09jsw]

Nice would be about 470whp and 410wtrq on E-85.

thanks. Intake was sent out to be ported for the fun of it and will be back in the shop for a tune at some point.

 

[bunk22]

I get that dyno's are for tuning and in the past, I've used dynojet's that had printout's like 09JSW. On my old 03 Cobra, I ran it on two dyno's, same type, one on the East Coast, other on the West Coast and you could have laid the curves on top of each other, the correction factor was perfect, matched almost exactly. So, I don't know much about this dynojet, how they correct for the numbers (other than it is an SAE correction), what gear they use for the auto (if that matters), they only do 4th gear runs on the dyno in non-auto cars, etc. The non smooth lines means to me the car isn't strapped down properly, I've seen cars skip on the rollers. The tuning is really the big deal and he does street tuning with dyno tuning to fine tune it. It needs a bit more tuning between the 3-4.5 rpm range, some surge if you half throttle it but it's not bad at all. If it were, I would have it back at his shop today.

This was his first auto GT 350 IM tune so there is a learning curve and of course, the 6 speed cars show a bit more power up top with same modes, 440-445rwhp or so is what I saw. The hp curves didn't look quite as flat as mine up top but better than falling off I suppose. For me, the car needs to run well on the street and he has it 95% there. The surging is small, only between 1000 rpm's but it's there. We will work on it.

The E85 is next but I'm not sure about the injectors yet, stock, not stock, don't know. I'm doing research and my tuner is torn between stock and not stock.

 

[Terminator2]

thanks. Intake was sent out to be ported for the fun of it and will be back in the shop for a tune at some point.

I'm curious if it gains anything when ported. Might need to port match the heads to see gains as the ports on the GT350 manifold are a little larger that the intakr ports on the stock heads.

 

[MyFirst5.0]

.. Lots of curves in the graph and he doesn't use a fan to help cool the motor or simulate airflow. Regardless, it's for tuning, so I get that.
]

what shop doesnt use a fan to cool the car? i imagine that car was super heat soaked after a few pulls

 

[Terminator2]

I haven't seen a lot of GT350 mani dynos, but is that relatively flat horsepower reading from 6300 to 7500 normal? I thought it gained more and more the higher it rev'd. Maybe there's some elevation there, but it does look pretty flat.

Kinda normal they hold power pretty well but they peak around 7200-7300 normally on the coyote. Peak hp goes up by 20-25 but hp gains at 7500 can be as high as 60 hp vs the stock manifold.

 

[bunk22]

what shop doesnt use a fan to cool the car? i imagine that car was super heat soaked after a few pulls

This shop does not. I've had over the years, a h/c/i/supercharged 1995 Mustang GTS, a modified 2003 Cobra, a 2005 C6 with a VR, FAST, custom cam, full exhaust, tune, a 2012 Mustang GT with CAI, full exahust, tune and thus have some experience over the years with dyno tuning. This place never uses a fan, they don't even have one. My biggest issue is simply to tune my car where it drives strong with no drivability issues. Is what it is here.

 

[Terminator2]

....I know there is a big thread on this so if it needs to be moved, so be it. For now, I don't run my car like I used to race my C6. But I thought it was time to go for the GT350 on my 6-speed auto with the tuning available.

My mods are JLT, GT 350 IM, 1 3/4" long-tubes, x-pipe with no cats and the local Rick Fast tune; my car came with 3.55 gears. My goal, requirement if you will, was no large loss of low end torque and no surging. Rick said there is some surging if I get on it hard but it actually barely noticeable. The dyno shows loss of low end torque but again, my butt-dyno didn't notice it. No E85 tune as of yet but that will be next.

It's nice that my tuner's shop is 5 miles from my shop and he will work with the car over time with issues or simply fine tuning the tune. Now as far as the dyno, I think it's a dyno jet. I've had 4 Mustangs now and a C6 and I've never seen this exactly format. Lots of curves in the graph and he doesn't use a fan to help cool the motor or simulate airflow. Regardless, it's for tuning, so I get that. The numbers are SAE corrected. I know he doesn't dyno in 5th gear on the stangs so I don't know what gear he went to on my auto.



This was a dyno after my long-tubes against the new 350 IM, some loss in low end torque from 4000-4500 rpm...

From how well it's holding power up until 7500 looks like you could have the limiter set at 7900 and have it shift at 7700-7800.

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