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first dyno pull

CALLAWAY1988

Well-known member
Joined
Feb 26, 2004
Messages
82
Location
atlanta
Corvette
1988 CALLAWAY
well, i am going to try to do our first pull on the 88 se in years. a little performance shop not far from the house that deals with grand nationals is holding a dyno day. i guess then we can begin the process of tuning it back into shape. my question is, since i have never been involved with a dyno pull, what should i expect, and what is the ideal conditions for such an event.
 
As the self proclaimed dyno king of the forum(as my car made MANY MANY pulls during tuning over the years), I can offer you a few thoughts.

First.... Callaway TT's hate the dyno. The intercoolers are not placed in a position to do anything while on the dyno. So if youre numbers aren't what youre expecting don't get too upset. Remember while going down the road the functional ducts under the hood are gonna lower your intake air temps a bunch. In cool air driving down the road, my car probably laid down another 30-40rwhp/50-60rwtq as to what the dyno showed...it would be a COMPLETELY different car.

Second....Id run some good gas b.c of the heat build up. The safety net is worth it when you think about the cost of your short block.

Third..... listen VERY closely for detonation during the pull unless youre "driving" and then have someone one else listen for you. Cut off immediately if you hear it. Make sure youre hooked up to a wideband o2 also.

Last...obviously the ideal conditions would be 50 degrees with no humidity, but basically the cooler the better. I always wanted to get some dry ice or a CO2 fire extinguisher and freeze the intercoolers before a pull, that will net you the best numbers. Ambient air temps over my motor were in excess of 150 degrees when we were tuning.

Pulls are usually done from 2k rpm to redline. Don't let them run it too long between pulls...I found my car really wouldn't cool down much after the first pull even when the fan on the radiator....a big radiator should help some.

here is a link to my graph...the most overposted dyno sheet on the web :L :L :L
http://members.aol.com/surfnsun1/dyno2.jpg
 
I thought someone said something about ice for intercoolers. i am scheduled for next sat morning at 9.00 am the first pull of the day. i only have to drive it one mile to dyno shop. i should be able to cool it back down before the pull. it is almost due fuel now so i will again top it off with 93 octane. would you recommend anything to help that?
 
As long as you keep the intercoolers nice and cool and use stock boost, 93 octane will work. Obviously you want to make sure your oil is up to temp before doing your runs, so your 1 mile drive wont get that done.

You can use ice, but when it melts it will make a mess. Although I never did, I certainly wish I had, I was just concerned about water running everywhere.
 
WOULD U RECOMMEND HIGHER OCTANE FUEL FOR THE RUN? CAM2 OR EQUIVALENT?
 

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