Limits to stock long block?

[Fast SVT]

Seems like a nice community and I found it via mightymustangs.net...

Anyways, I am new to the KB Termi coming from a 416CI and sprayed GTO. Wondering what sort of HP the stock long block can support and maintain a reasonable degree of reliability. The Termi I bought already has a 2.2 KB unit and is pushing 600rwhp on 93 and 630rwhp on 93/100mix on 17psi. How much more SHOULD the motor be able to support? I am thinking of running a 20psi tune on 93+meth for the drag strip.

Going to keep the IRS so I know I'll need some LVL 5 half shafts.

[BurnTire]

I have been maxing 625 on VP109 for about 3 years now with no problems. 600 may be pushing it on 93 octane.

Keep the stock Half Shafts and stay out of the wheel hop. Trust me I have been down the LVL 5 road and it was not pretty.

[Fast SVT]

Well, supposedly it already makes 600rwhp on 93...that is what the previous owner claimed and has the dyno sheet for.

It is a full exhaust (LT's no cats) with a ported intake....but numbers aren't really what matters to me. Once I get it on the track I'll be more interested in the MPH plus I am having it retuned for METH anyways.

Thanks for the advice on the half shafts.

So you are saying that 600 is about the limit before I should consider breaking into the motor?

[BurnTire]

Well, supposedly it already makes 600rwhp on 93...that is what the previous owner claimed and has the dyno sheet for.

It is a full exhaust (LT's no cats) with a ported intake....but numbers aren't really what matters to me. Once I get it on the track I'll be more interested in the MPH plus I am having it retuned for METH anyways.

Thanks for the advice on the half shafts.

So you are saying that 600 is about the limit before I should consider breaking into the motor?

No 600 is safe. There are many cobras making that much power or more. The key is to have a safe tune for pump gas. 600 seems high for 93 octane.

[About2Bite]

I've been on 19# and running 93 all summer with no probs, running a fairly conservative tune also from what I've seen. Gotta love the KB, your tune has a lot to do with it.

[BurnTire]

I've been on 19# and running 93 all summer with no probs, running a fairly conservative tune also from what I've seen. Gotta love the KB, your tune has a lot to do with it. Where do you get 93 in Arizona?

[About2Bite]

I moved back to Indiana like 8 months ago... And am hating it. I always ran 100 from Loves or a mix of 100 and 91. I haven't had any probs with just straight 93 out here though. Wish we had it in AZ.

[2nd2nunn]

stay away from the meth kits. our tuner has a stock 03/04 cobra motor with a 2.2 kb crower cams 19 psi on race gas it made 640 on a very Conservative tune. ive heard of people making a lil over 700 put it was race only app

[Fast SVT]

This topic about meth kits is actually bordering on the amusing. Depending on who I talk to about it I get different answers. And I'm not talking about small shops with no rep.

Some say not worth it while others say the Octane boost is worth it if you want to avoid the expense of race gas (plus a moderate cooling benefit).

[2nd2nunn]

This topic about meth kits is actually bordering on the amusing. Depending on who I talk to about it I get different answers. And I'm not talking about small shops with no rep.

Some say not worth it while others say the Octane boost is worth it if you want to avoid the expense of race gas (plus a moderate cooling benefit).

the meth pumps are just not reliable, when it craps out so does the engine. we have even changed out the orifice in the meth pumps and just used H20 on a couple cars. if you want to avoid the cost of race gas, go E85 and have best of both worlds

[ttocs]

I moved back to Indiana like 8 months ago... And am hating it. I always ran 100 from Loves or a mix of 100 and 91. I haven't had any probs with just straight 93 out here though. Wish we had it in AZ.

What part? I moved back to evansville a couple of months ago.

[SloSVO]

I've always thought of a meth kit as a band aid.. just run good fuel...

[Stanger00]

thats what I always thought when it came to meth kits. more components to potentially fail and cost a motor build.

I plan to run a meth injection but I wont get tuned for the added octane boost. I plan to run strictly for IAT cooling this summer. Even with the intercooler my car pulls just about all timing in 110-115 heat...I only drove in september so far...

I will just suck it up at the pumps when I want to run 100+ octane.


I've seen lots of 03-04 cobra hittin 17-22 psi and 600+ hp on pump gas with stock long blocks. I mean seen on the intraweb.

[WildBill]

thats what I always thought when it came to meth kits. more components to potentially fail and cost a motor build.

I plan to run a meth injection but I wont get tuned for the added octane boost. I plan to run strictly for IAT cooling this summer. Even with the intercooler my car pulls just about all timing in 110-115 heat...I only drove in september so far...

I will just suck it up at the pumps when I want to run 100+ octane.


I've seen lots of 03-04 cobra hittin 17-22 psi and 600+ hp on pump gas with stock long blocks. I mean seen on the intraweb.

The only thing is that you have to account for the additional fuel in your tune you're adding by using the Meth

[2nd2nunn]

The only thing is that you have to account for the additional fuel in your tune you're adding by using the Meth

remember some tuners jack up the timing too, thats why alot blow up when the meth pump goes south

[WildBill]

remember some tuners jack up the timing too, thats why alot blow up when the meth pump goes south

Yup.....and it happens VERY quickly!

[Stanger00]

so just hooking up the meth injection un-tuned will lean the car out?

[WildBill]

so just hooking up the meth injection un-tuned will lean the car out?

No sir. It will make it fat. Too fat can lift ringlands, wash cylinder walls.....ect

[Gene]

My new motor isnt stock, but I had the same turbo set up on my old car with a stock motor. I ran 16psi with 14* on 91 octane and similar combos were making 650rwhp. With 24psi and 110 octane, it was retarded power and the stock block took it like a champ. It's all in the tune man. If you're local, give PSR a call and have Devin tune it.

[Mr.GSXR1000]

E85 if you have any pumps around you

[03whitecobra]

I'm running 697 hp here in Germany

[Fast SVT]

Where in germany? I'm in Wiesbaden and pushing 630 with meth.

[03whitecobra]

Stuttgart

We've met but it has been a long time ago. In Landstuhl at the helicopter shoot.

[Fast SVT]

I was not there had to of been someone else. I remember that event though

[2nd2nunn]

there is a guy around here making 770rwhp on a stock 03/04 motor(3.4 whipple and 25psi E-85) hell he even drives it about 2,000 miles a month

[El Jefe]

TuksonMike ^ Sounds like hes itching for more power too.

Over the past 5 years Ive been perusing all the Cobra forums and there are more than a handful of Cobra long blocks making over 1000 to the wheels with stock internals. The tune and the fuel is the key to it though. Weak point in the motor is the pistons

More:


1. It's not the block that's the problem... a prepped stock block will live at over 1200 horse...
2. the pistons don't shatter... they are forged 4032 pistons they are very strong...
3. The failures that are piston related are generally due to the outrageously tight piston to wall clearance... which elevated cylinder temps from...
hot spot induced detonation, lean detonation, too much timing detonation, and just old school over heating... cause them to try to seize to the walls!!!
4. Sustained wide open throttle passes(high speed roll races) of 30 seconds or more, or BANZAI 5th gear top end pulls.. will also tax the fuel delivery and heat removal systems of otherwise well tuned modified cars.

Stock motor, compund boost making 948rwhp on the stock motor


http://www.youtube.com/watch?v=WERkzAE36G4

850rwhp stock motor compound boost


http://www.youtube.com/watch?v=TP03Sqqg2es

1020rwhp stock motor compound boost


http://www.youtube.com/watch?v=TLyPb5MEfX0

914rwhp stock motor compund boost


http://www.youtube.com/watch?v=trpSMlo7pN8

http://www.modularfords.com/forums/showthread.php/55407-General-answers-for-03-04-cobra-(mods-cost-and-performance)

[2nd2nunn]

TuksonMike ^ Sounds like hes itching for more power too.

Over the past 5 years Ive been perusing all the Cobra forums and there are more than a handful of Cobra long blocks making over 1000 to the wheels with stock internals. The tune and the fuel is the key to it though. Weak point in the motor is the pistons

More:



Stock motor, compund boost making 948rwhp on the stock motor


http://www.youtube.com/watch?v=WERkzAE36G4

850rwhp stock motor compound boost


http://www.youtube.com/watch?v=TP03Sqqg2es

1020rwhp stock motor compound boost


http://www.youtube.com/watch?v=TLyPb5MEfX0

914rwhp stock motor compund boost


http://www.youtube.com/watch?v=trpSMlo7pN8

http://www.modularfords.com/forums/showthread.php/55407-General-answers-for-03-04-cobra-(mods-cost-and-performance)

You also got to remember that most to all of the compound boost cars are DEAD. there was a stock motored 03/04 Cobra out in Texas that made 978rwhp and lived 14 months and was beat to shit every day since it was a DD

[El Jefe]

You also got to remember that most to all of the compound boost cars are DEAD.
I havent heard of any???

[2nd2nunn]

I havent heard of any???

hellion went through 3 cobra engines that turbonetics was purchasing for them while trying to make the compound boost stuff work.

[El Jefe]

Been asking around and seems that the case. I did find this though today in regards to the 850rwhp Cobra in the video above


the 850rwhp cobra was tuned by me... we eventually removed the blower and ran the turbos.. the motor is STILL RUNNING in another car after Ryan went 9.19 @ 158mph last year... 3yrs on that motor making over 1000rwhpSo it is possible