GT350 IM **without headers**

[wildcatgoal]

Does anyone have an GT350 IM without headers? Dyno? Your thoughts? Thx!

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[gameovergt]

Does anyone have an GT350 IM without headers? Dyno? Your thoughts? Thx!

nevermind!

 

[16MustangVet]

seems to me most cars ive heard its the H pipes that make them raspy and loud. long tubes x pipe and some short resonators woukd be perfect i think.

slp loud mouth2s and x pipe is still best sounding setup imo.

 

[wildcatgoal]

I quieted my car down by having 2 small resonators put into the offy h pipe if that helps any? :shrug:

I have a mid-mounted muffler and the only place I could really put resonators is where the usual mufflers go, eliminating my J-pipes, which I want to avoid.

More importantly, headers are insanely expensive.

Let's not make this a exhaust debate thread y'all. GT350 IM results without headers... that's it.

 

[silver86]

Just completed my install, without headers. No dyno results yet, so this doesn't really help, but planning on getting on the rollers in the next week or so before I install the cat deletes.

 

[MarkH]

Does anyone have an GT350 IM without headers? Dyno? Your thoughts? Thx!

That would be similar to a FRPP3 build which does not use headers. Car in the LMR video only uses catback, check that.

 

[Gibbo205]

Yes.

My dyno results all same dyno (maha engine crank power) were:

Stock: 410-415HP (Ford UK Claim 410HP) so the dyno proved its accuracy
SCT Canned Tune: 435HP
JDM Canned Tune: 440HP
Lund custom tune with PMAS CAI: 472HP
Lund custom tune with GT 350 IM, Stock TB & GT 350 CAI: 500HP
Lund custom tune with GT 350 IM, GT 350 TB & GT 350 CAI: 516HP


All done on same dyno, different days though but on GT 350 runs the plot was identical until 6200rpm where the larger 350TB then pulled ahead of the stock TB by around 10HP.

All figures are crank due to the type of dyno I use in Europe. Car has stock headers and Corsa Sport catback system.

 

[wildcatgoal]

Okay, so if we take Ford's claim (in the US) or 435 HP and the fact my car dynos at 391 HP stock, that equates to approximately a 10-11% driveline loss. Let's do 12% for safety. I have recalculated your numbers accordingly, below.

Stock: 360-365HP
SCT Canned Tune: 383HP
JDM Canned Tune: 387HP
Lund custom tune with PMAS CAI: 415HP
Lund custom tune with GT 350 IM, Stock TB & GT 350 CAI: 440HP
Lund custom tune with GT 350 IM, GT 350 TB & GT 350 CAI: 454HP

The latter two are without headers? That seems about the same as with headers numbers I am seeing.

 

[Gibbo205]

Okay, so if we take Ford's claim (in the US) or 435 HP and the fact my car dynos at 391 HP stock, that equates to approximately a 10-11% driveline loss. Let's do 12% for safety. I have recalculated your numbers accordingly, below.

Stock: 360-365HP
SCT Canned Tune: 383HP
JDM Canned Tune: 387HP
Lund custom tune with PMAS CAI: 415HP
Lund custom tune with GT 350 IM, Stock TB & GT 350 CAI: 440HP
Lund custom tune with GT 350 IM, GT 350 TB & GT 350 CAI: 454HP

The latter two are without headers? That seems about the same as with headers numbers I am seeing.

Seems a bit high to me and I'd factory driveline loss at more like 12-15% on a manual and 15-18% on an auto, but no one really knows. The dyno design I use is designed for crank power and at that it seems very accurate, considering numerous stock Mustang GT's have run on this dyno and all made 410-415HP which is right on the money of what Ford claim on a UK car.

My car is an M6 and I run it on very good fuel, RON99 Vpower which when Lund did the datalogging were shocked how my car was making 32 degrees WOT timing with zero knock. They said pump gas of that quality in the US is available but very rare.

What a GT 350 put down wheel power wise? We know they are 526HP crank and my car is making just under what a stock GT 350 makes.

My car also has FRPP separators on each bank and Lund did say this can help with extra timing as no fuel dilution happening.

 

[Gibbo205]

Found this from Lund testing:

Bone stock, Lund’s 2016 GT350 pulled 442-horsepower and 373 lb-ft torque with 93 octane fuel on the dyno. With e85 ethanol fuel and tweaking the calibration, Lund Racing reported that the 5.2L engine was able to pick up an extra 38-horsepower (480 RWHP) and 33 lb-ft of torque (406 RWTQ). Lund continues to tweak and test its new tune so stay tuned for more results.


Also some test have shown GT 350 as high as 470WHP stock, but that is the difference in dynos, some are happy, some are sad.

Like dynojet give much higher WHP figures than say Dyno Dynamics and Mustang for example.

They are just measuring tools and should not compare results from different dyno type as they can vary quite a bit even when running identical cars.

 

[wildcatgoal]

The GT350 engine is hand built. On the exact same dyno, the exact same day, two GT350 owners in my club achieved almost 30HP discrepancies - neither of the GT350s were modified.

 

[newkidnik]

Seems a bit high to me and I'd factory driveline loss at more like 12-15% on a manual and 15-18% on an auto, but no one really knows. The dyno design I use is designed for crank power and at that it seems very accurate, considering numerous stock Mustang GT's have run on this dyno and all made 410-415HP which is right on the money of what Ford claim on a UK car.

My car is an M6 and I run it on very good fuel, RON99 Vpower which when Lund did the datalogging were shocked how my car was making 32 degrees WOT timing with zero knock. They said pump gas of that quality in the US is available but very rare.

What a GT 350 put down wheel power wise? We know they are 526HP crank and my car is making just under what a stock GT 350 makes.

My car also has FRPP separators on each bank and Lund did say this can help with extra timing as no fuel dilution happening.

Nice, I didn't realize you could run dual FRPP separators. Can you by chance post your dyno plots of pre and post GT350 mani as well as a pic of the seperators underhood?

 

[Gibbo205]

Nice, I didn't realize you could run dual FRPP separators. Can you by chance post your dyno plots of pre and post GT350 mani as well as a pic of the seperators underhood?

They are on the GT 350 Awesome thread I believe.

 

[Terminator2]

Found this from Lund testing:

Bone stock, Lund’s 2016 GT350 pulled 442-horsepower and 373 lb-ft torque with 93 octane fuel on the dyno. With e85 ethanol fuel and tweaking the calibration, Lund Racing reported that the 5.2L engine was able to pick up an extra 38-horsepower (480 RWHP) and 33 lb-ft of torque (406 RWTQ). Lund continues to tweak and test its new tune so stay tuned for more results.


Also some test have shown GT 350 as high as 470WHP stock, but that is the difference in dynos, some are happy, some are sad.

Like dynojet give much higher WHP figures than say Dyno Dynamics and Mustang for example.

They are just measuring tools and should not compare results from different dyno type as they can vary quite a bit even when running identical cars.

I saw one guy claim 540whp on E-85 on stock injectors on a GT350. Im calling that dyno as they are the same as our little injectors. They support 45-46lbs/min max on E-85 which is good for 460whp at 100% VE. This one had kooks headers on it but those are not worth 60whp lol.

 

[Sasuketr]

Without headers, if we put a 5.0 with gt350 im, cai, and tb against a stock gt350, all on 93 octane, what is the outcome?

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