sorry my mistake... :rollseyes
Added 310 Pulley
- Thread starter Jim Vaccaro
- Start date
Sorry no scanner
Jim V.
congrats on the new numbers
we all new it wouldn't be long before you got a pulley Does yor boost drop at all? also at what rpm does it make peak hp? is your #'s sae or std?
Leon
we all new it wouldn't be long before you got a pulley Does yor boost drop at all? also at what rpm does it make peak hp? is your #'s sae or std? Leon
Boost holds steady,Numbers are STD..The peak numbers i'll try and post tomorrow..Dyno sheet is in my car.
Hopefully i can get it scanned..
Jim V.
Hopefully i can get it scanned..
Jim V.
Mark (mjchip) has a L pulley and he said it gives him 12 psi. It also states it in his sig.
How is a bigger pulley (3.10) making more boost (13 psi) than a smaller puller L (2.93) (12-12.5 psi)
How is a bigger pulley (3.10) making more boost (13 psi) than a smaller puller L (2.93) (12-12.5 psi)
Good question!!:??:
All i can say is The owner of the shop Mustang Magic put 4lb lower pulley on his Cobra and got a bit over 12lbs.
We put 310 on mine and got 13..He used same gauge to check both cars..
Jim V.
Great numbers, Jim. Sounds like the perfect size pulley for the '03.
JT
JT
Well, there are a number of things at play here:
1. On a nice cold day, I can see 13psi of boost with the L pulley and on a hot humid day it's more like 12psi. So, weather is a factor.
2. If Jimmy V. has a higher flowing intake than mine (which I bet he does based on his filter size), he is probably losing about 0.5psi less pressure from atmospheric than I am. That 0.5 psi adds to the measured boost number.
In essence, with the L pulley, if I upgrade my filter and increase the throttle body I should see around 14-14.5psi of boost total on my boost gauge.
Hope this helps clear things up.
MJ
the only thing I could think of is belt slippage?
So, I am reading this right - that the 3.10 pulley makes more consistent boost throughout the RPM range than the 2.93 or the 2.8?
Guys, I need some help here. I have been debating this pulley issue for awhile and was just about convinced to go with the 3.2 I really do not want to install a chip and a friend went with the 3.25 and the A/F numbers looked pretty good. Rick or Jim, in your opinion how far would you go on the pulley without a chip?
I would be interested in seeing a air/fuel curve for a 03 Cobra with a 3.10 and a 3.20 pulley and no chip.
What size is the stock pulley? 3.4?
What size is the stock pulley? 3.4?
Stock pulley I believe is 3.65. Jim nice numbers. Have you upgraded your Throttle Body?
Jim,
WOT on Joe's dyno, your boost held 13psi constant from 3.5K rpm to 6.2K rpm? This is with the stock dump solenoid? (not the prototype dump actuator Rick was working on).
Did joe's lower pulley keep a constant level of boost? Thx...
MJ
WOT on Joe's dyno, your boost held 13psi constant from 3.5K rpm to 6.2K rpm? This is with the stock dump solenoid? (not the prototype dump actuator Rick was working on).
Did joe's lower pulley keep a constant level of boost? Thx...
MJ
Yes mine held 13 with stock setup. and Joe's lower 4lb pulley did the same..
Jim V.
Yes i upgraded to Pauls single blade setup..I am sure that helped..
Jim V.
I would get chip even with the 3.2 pulley.AF might be good but there is a lot of power in the tune..
Jim V.
Just single blade?
Jim,
Did you only upgrade to Paul's Single blade TB or did you do the TB and blower intake elbow? Is the 3.1 pulley a press on?
Thanks,
KO
Jim,
Did you only upgrade to Paul's Single blade TB or did you do the TB and blower intake elbow? Is the 3.1 pulley a press on?
Thanks,
KO
Re: Just single blade?
Yes,,Yes and Yes.........
Jim V.
Yes,,Yes and Yes.........
Jim V.
:read: I hate to break out the magazine, but in a MM&FF they put the stock Lightning pulley on, and it "claims" a peak of 14.5 psi. So whatever size the L has, which I thought was a 2.93", it is saying that 14.5psi is peak. :shrug:
That probably just makes the argument worse :??:
That probably just makes the argument worse :??:
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