Thanks for the review. I appreciate your fairness. Some folks would dyno with the same programming and post the results.
I think you can pull even more HP out. Call me.
One thing you did not mention. The dyno done with the zip-tie. Was it done with the hood open? If so, your results are going to show less delta than in real life.
The main purpose of the TRAP is to draw ambient air into the intake track vs. underhood hot air. The TRAP and the zip tie produce much less pressure loss than the stock box closed, but the difference is much more than you indicate.
You might try this:
Dyno the zip with the hood closed, then the TRAP with the hood closed, since that is the way you drive.
At 135 IAT, you will lose 8 degrees of timing (-10 RWHP) with the zip. The TRAP is still seeing ambient. (Both pulls should be with a good fan directing air into the front of the car, as it would be on the street.
Since you are familiar with LS1Edit, you know that pig rich at the top many times results from the COT protection circuit when the EGT is to high, due to new airflow, which causes overheating of the cats resulting in the pig rich condition. You can gain even more hp by changing the COTP to 110%. This elevates the four FE thresholds to eliminate this problem. Rarely, doe this circuit kick in on the road, but GM is protecting their 7 year warranty on the cats.
How did you determine the pig rich state? I didn't see the Wideband readings.
Your numbers are quit good, anyway, since they beat our numbers with the TRAP, LS1 Edit, stock exhaust, Meziere at 382.2 RWHP. Either way the TRAP outflows all other intakes on the market period.
Here is the flowbench result of our system vs. stock:
This was done at Dan Gurney's AAR shop by their airflow guru.
When you get to the track, watch the trap speed. This is a much better indicator of real world HP than the dyno.
One last question. What was the correction factor on your best TRAP pull?
Our customers have seen between 387 RWHP and 397 with the TRAP, LS1 Edit headers, and Stinger exhaust.
Check out this customer's TRAP speed:
georges03zo6
Senior Member
57 posts [100%]
Pittsburg ca
track times for Halltech TRAP and LGM longtubes... 1:29 AM 10/11/2003
"Last week I added the Halltech TRAP intake, LGM longtubes and had the car tuned via LS1 Edit. It did 387rwhp/380rwtq sae. Bone stock the best I could do was 12.6@114mph with a 2.0 60ft. Tonight I ran the following after adding the above mods and also on my stock F1's."
1. 12.123@119.218mph 1.979 60ft
2. 12.124@119.376mph 1.959 60ft
3. 12.186@118.137mph 1.929 60ft
His TRAP speed indicates the real difference. Some of that can be attributed to the headers.
Generally you should see .1 and 1 mph for every 10 HP. Your wife's trap speed should be darn close to this customers.
Here are the other results:
http://forums.corvetteforum.com/zerothread?id=635927
http://www.corvettec5.com/store/?page=shop/dyno
http://www.corvettec5.com/store/?page=shop/tricpics
Halltech TRAP system results.
Let me know how 11 second momma does.
Jim Hall
