Guess the HP number.

laidback01 · Dec 30, 2018

About to have my car on the dyno again. Previously it had a mmr 4.75 stroker with a ported stage 7 eaton from Steig, 2.76 upper, longtubes, 60# injectors, dual fpdm, and upgraded fuel pumps. NC dyno.

It made 460/460 on 11lbs boost

I've now put on the Afco heat exchanger and 4# pulley.

What do you think it will make? Thanks in advance.

Sara Helsel · Dec 30, 2018

laidback01 · Dec 30, 2018

laidback01 · Dec 30, 2018

Sara Helsel said:
485

Thanks for your input, however I think you're low.

Bdubbs · Dec 30, 2018

It will be heat soaked after one pull. What fuel that will make a difference.

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c6zhombre · Dec 30, 2018

What is the compression on that 4.75 stroker? It seems like your first dyno of 460/460 was really low for a ported eaton and that extra displacement. My 100% factory longblock '04 vert made 461/491 with a factory eaton, 2.76 upper, factory lower, factory manifolds.

roy_1031 · Dec 31, 2018

c6zhombre said:
What is the compression on that 4.75 stroker? It seems like your first dyno of 460/460 was really low for a ported eaton and that extra displacement. My 100% factory longblock '04 vert made 461/491 with a factory eaton, 2.76 upper, factory lower, factory manifolds.

I agree. My stock bottom everything 2.80 upper car made 465/505 non ported. Stock logs and a ORX magnaflow truX for exhaust.

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V6&V8SHO · Dec 31, 2018

Hero dynos and heartbreaker dynos also make a difference when comparing car to car.

c6zhombre · Dec 31, 2018

V6&V8SHO said:
Hero dynos and heartbreaker dynos also make a difference when comparing car to car.

That's out of the zip code for even a heartbreaker dyno. If I had that kind of money rolled into a 4.75 stroker and stage seven hundred and seventy-seven ported blower, I'd be pissed seeing 460 pop up.

Maybe mmr is the problem here. Might need a compression test on that motor before it gets spun apart.

TERMN8U · Dec 31, 2018

Somethings wrong with your numbers man...
My 04 had stage 3 or 4 steigmier ported blower with a 4 pound lower, 2.76, cold air intake and larger MAF, KB boost a pump, maybe injectors (can’t remember), magnaflow cat back, steeds.ca tune and it made 525whp and I think 560wtq.

roy_1031 · Dec 31, 2018

V6&V8SHO said:
Hero dynos and heartbreaker dynos also make a difference when comparing car to car.

That’s like she ran off with your best friend and took your dog heartbreaker.

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V6&V8SHO · Dec 31, 2018

roy_1031 said:
That’s like she ran off with your best friend and took your dog heartbreaker.

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Saving this! LOL!

My car with reman 03-04 motor steggy stage 4 port 2.93 upper 4lb lower 527whp and 549wtq.

TERMN8U · Jan 1, 2019

Your numbers sound bang on from what I remember.

Buckwheat 1 · Jan 1, 2019

laidback01 said:
About to have my car on the dyno again. Previously it had a mmr 4.75 stroker with a ported stage 7 eaton from Steig, 2.76 upper, longtubes, 60# injectors, dual fpdm, and upgraded fuel pumps. NC dyno.

It made 460/460 on 11lbs boost

I've now put on the Afco heat exchanger and 4# pulley.

What do you think it will make? Thanks in advance.

All of it

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Skitzerman · Jan 1, 2019

What are the timing and AFR numbers on your current tune? If you have an ultra-safe low timing, fat AFR tune, you won't pull 500HP/TQ numbers.

laidback01 · Jan 4, 2019

Skitzerman said:
What are the timing and AFR numbers on your current tune? If you have an ultra-safe low timing, fat AFR tune, you won't pull 500HP/TQ numbers.

I told the tuner make it safe. Wasnt trying to have it turned to the moon especially on a new motor. It's got maybe 3k on the new setup now. Should be on the dyno no later tha monday (hopefully).

3xBlackCobra · Jan 4, 2019

I thought those numbers looked way low, but 11lbs of boost seems pretty "safe" tune with that setup.

roy_1031 · Jan 4, 2019

What’s your compression at?

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CobraBob · Jan 4, 2019

You don't have specifics about the tune? Like timing? AF?

Regardless of how safe the present tune is, it should be interesting to hear what the new numbers with the added 4 lb. lower and new tune yield. Be sure to update the thread.

laidback01 · Jan 7, 2019

Took the car to the dyno today and SCT forced my tuner to do an update to his software. In turn, he said the software was making him take an emissions class per the EPA. Therefore no tuning was done today. I'm hoping to get the car back on the rollers by next week.

Guess the HP number.

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