[Cupcake37]

This is the first results of tune after install of parts listed below. Performed 1 year ago


Previously car made 440hp and 469torque (on E85) about 1 year ago, 30,000 miles ago
Only mods at this point were
- Flex Fuel Kit
- ARH headers and Cat Delete.
These are results of tune after install of new parts as of last week jan 2020


The above image is the dyno results after installing
-MSD PORTED intake Manifold,
-Ported LT5 Throttle Body
-Roto Fab intake

Now the car makes 428HP and 430 TQ after tune while running E85, which is less power and less torque as previously.


-Yes vehicle was previously tuned by same tuner as before and run on the same exact dyno as before In same gear, & same tires.
-Reputable tuner as well
-Originally tuner thought something was wrong with dyno because of lower numbers.
Results as of 2 days ago, trying to confirm if previous results were because of issue with dyno


-Today I took the vehicle into another dyno just to see what it put down, Just to verify it was the previous dyno wasnt correct.
See image above for those results

"Update 2/25/20 ""Update 2/25/20 " over this past weekend blown head gasket was taken out,




-Without a doubt this was a very bad leak and amplified by all the extra air that was going into the engine after the new upgrades, vehicle feels a lot different now and you can even hear the intake, Tuning scheduled for 3/3/20 will update then.




-The car has a lot better throttle response and a bit more low-mid range pull but overall it’s as if nothing’s changed.
-Im not expecting to make 500 wheel, but almost everywhere I have seen, vehicles with these mods make between 470hp-485hp, some even higher on rare occasion.
-The only current issue I have is a Header/exhaust leak on driver side where the header meets the block. Just got in my gasket and will be putting them on over the weekend but can all this power loss be caused by a leak?
I really don’t know what’s up with the car. Still runs fine but not crazy gains to be seen or felt really with the exception of more throttle response and some more mid range pull? Barely??? Any ideas folks?? Trying not to get caught up in numbers but something just isn’t right.

[JCunningham]

you still on stock manifolds and cats? if so those are very good gains. Where is the leak? as long as its more than 18" (i believe) downstream it won't make a difference.

[MP3BOOSTED]

id say jump on another dyno and see if you read any differently.

[95 imp]

Sounds like you have a lot of air going in and not a lot coming out. Cam/Exhaust are obviously your bottlenecks.

Exhaust is easier, and you'll need to clean it up anyway if you have a cam, so that would be the next logical step to me.

[6spdhyperblue]

Never seen a msd follow the same curve as the stocker. Maybe the leak is effecting things and it’s not retarding the cam. The big jump at 3700 rpm never happened. Have any logs?

[geaux_tigerss]

Who tuned it? What exactly did they do? I'd probably ask these questions. Specifically: Did you tune MAF? Did you tune VVE? Did you tune PE? Did you modify the torque tables? If the answer is "no" to any of those, your next question should be "why not?"

[That1guy_tim]

How many miles since last dyno tune?? Just spit balling ideas here but being direct injected engine and running E85 you might have some carbon buildup causing the decrease in HP... Do you have a catch can ?

[KingLT1]

E85 doesn't cause carbon build up...it burns far cleaner then gasoline. that was the whole point for flex fuel in the beginning.

[Cupcake37]

Originally Posted by JCunningham

you still on stock manifolds and cats? if so those are very good gains. Where is the leak? as long as its more than 18" (i believe) downstream it won't make a difference.

No Stock Manifold, No Cats, First image of what car made originally 1 year ago, 2nd image down is what its making now after installing additonally, MSD ported intake, Rotofab and LT5 TB. Leak is driver side header where it meets the block.

[Cupcake37]

Originally Posted by MP3BOOSTED

id say jump on another dyno and see if you read any differently.

Jumped another dyno, Just updated post, see 3rd image down. Same results essentially.

[Cupcake37]

Originally Posted by 95 imp

Sounds like you have a lot of air going in and not a lot coming out. Cam/Exhaust are obviously your bottlenecks.

Exhaust is easier, and you'll need to clean it up anyway if you have a cam, so that would be the next logical step to me.

Yes sir cam is up next, but car is making way too low of power for the modifications.

[Cupcake37]

Originally Posted by 6spdhyperblue

Never seen a msd follow the same curve as the stocker. Maybe the leak is effecting things and it’s not retarding the cam. The big jump at 3700 rpm never happened. Have any logs?

Sorry no logs in hand

[Cupcake37]

Originally Posted by geaux_tigerss

Who tuned it? What exactly did they do? I'd probably ask these questions. Specifically: Did you tune MAF? Did you tune VVE? Did you tune PE? Did you modify the torque tables? If the answer is "no" to any of those, your next question should be "why not?"

Very Reputable tuner, he was kind of baffled by the results as well, told me to bring it back in after leak is fixed, But can a leak cause this much Power Loss?? maybe he tuned safely so car wouldn't run like dump.

[JCunningham]

Originally Posted by Cupcake37

No Stock Manifold, No Cats, First image of what car made originally 1 year ago, 2nd image down is what its making now after installing additonally, MSD ported intake, Rotofab and LT5 TB. Leak is driver side header where it meets the block.

is that the side the tuner put the o2 sensor on. if so he couldn't tune it. and the cars not going to run right. you cant have any leakes befor the o2 or 18" behind the o2. if he used the pass side for the o2 then fix your leak and reset the fuel trims because the drivers side is off. Your tuner shouldnt have tuned with that leak.