mark.barton Posted December 9, 2014 Report Share Posted December 9, 2014 I ran into an interesting problem this year when I was driving my car on the road course at Heartland Park and I think I know what it is and how to solve it, but wanted to ask the groups opinion.After two or three laps, accelerating out of the final corner on to the main straight, in second gear, the engine would go flat (a nose over type of flat) for a split second at wide open throttle, come back to full song, go flat again and come back. I could then shift to third, go wide open throttle down the straight with the engine feeling like it was pulling like it was supposed to. Forth gear, no problem. The throttle response was fine the remainder of the lap (slow second gear corners with hard acceleration out, fast corners, it didn't seem to matter). I thought I had forgotten to turn off the traction and stability control, so I stopped in the pits and verified the system was off. First lap out of the pits, things were fine. Next lap, back to the nose over.I think I'm suffering from the dreaded heat soak. Ambient temperatures were in the 80's one day and 90's on another day. I think upgrading the heat exchanger would solve the problem, but my question is: do I need a heat exchanger with fans or would a dual pass without fans work or is this a problem that has nothing to do with heat soak?Opinions? Mark Link to comment Share on other sites More sharing options...
2010KonaBlueGT Posted December 9, 2014 Report Share Posted December 9, 2014 I don't think you're describing heat soak. When mine would do it, I'd just be down on power across the board. I'd go from blowing the tires off to barely being able to spin them but that's it. Yours sounds like a fuel starvation problem. Phill Link to comment Share on other sites More sharing options...
Secondo Posted December 9, 2014 Report Share Posted December 9, 2014 +1 but you still need the heat exchanger with fans upgrade if you're tracking it. Link to comment Share on other sites More sharing options...
2010KonaBlueGT Posted December 10, 2014 Report Share Posted December 10, 2014 +1 but you still need the heat exchanger with fans upgrade if you're tracking it. Even if you're not (tracking it). I'd get heat soak and very noticeable power loss with just some spirited driving on the street, after about 2 or 3 'stoplight' blasts. And worse after installing the Whipple 2.9L SC. Phill Link to comment Share on other sites More sharing options...
ViperNC Posted December 10, 2014 Report Share Posted December 10, 2014 Yeah.... that's not heat soak. Heat soak is more of a constant continuing issue you can feel after you've been driving the car hard for a short period of time. Basically, it feels like the car has become lethargic and down on power and you have to let the engine cool off before the heat soak will go away. A good heat exchanger (as others mentioned) and radiator upgrade along with a larger capacity heat exchanger coolant reservoir will combat the heat soak issue. And if you're going to the extent or replacing the heat exchanger, get the fans. I think Phill is on to something with his idea. Your problem comes and goes quickly and indicative of a fuel delivery issue. Link to comment Share on other sites More sharing options...
gotoatz Posted December 10, 2014 Report Share Posted December 10, 2014 Any chance you were spinning and bumping the rev limiter?? Link to comment Share on other sites More sharing options...
Capt500 Posted December 10, 2014 Report Share Posted December 10, 2014 On the fuel issue- have you changed the in-line fuel filter lately (inside the frame rail under the driver's door)? If not that, maybe it's your belt slipping on the supercharger pulley, causing lost boost? Link to comment Share on other sites More sharing options...
mark.barton Posted December 10, 2014 Author Report Share Posted December 10, 2014 Any chance you were spinning and bumping the rev limiter?? There is always that chance, but when you hit the rev limiter, it feels more like a miss than the engine cutting out. Mark Link to comment Share on other sites More sharing options...
mark.barton Posted December 10, 2014 Author Report Share Posted December 10, 2014 I don't think you're describing heat soak. When mine would do it, I'd just be down on power across the board. I'd go from blowing the tires off to barely being able to spin them but that's it. Yours sounds like a fuel starvation problem. Phill It just seems so strange that it's noticeable only in that one corner exit (that's why I first thought it was the stability control kicking in. Same feeling). The rest of the lap, the car pulls as hard as it ever has. Question though: Would fuel starvation throw any error codes into the ECU that could be looked into? No check engine lights or warnings on the car, but just curious. On the fuel issue- have you changed the in-line fuel filter lately (inside the frame rail under the driver's door)? If not that, maybe it's your belt slipping on the supercharger pulley, causing lost boost? Replacing the fuel filter is on my list of maintenance items for the winter. I added it to my list after reading Phil's and Viper's posts and considering the car has 36K miles and I doubt the filter has ever been changed. Mark Link to comment Share on other sites More sharing options...
kawwy600 Posted December 19, 2014 Report Share Posted December 19, 2014 [quote name="mark.barton" Replacing the fuel filter is on my list of maintenance items for the winter. I added it to my list after reading Phil's and Viper's posts and considering the car has 36K miles and I doubt the filter has ever been changed. Mark The fuel filter should be replaced every 30k miles according to standard maintenance. Speaking on maintenance...the service manual says to replace the spark plugs at 90k miles, however the supplemental SVT manual says to replace spark plugs every 45k miles. Link to comment Share on other sites More sharing options...
barspen Posted December 20, 2014 Report Share Posted December 20, 2014 Replacing the fuel filter is on my list of maintenance items for the winter. I added it to my list after reading Phil's and Viper's posts and considering the car has 36K miles and I doubt the filter has ever been changed. Mark Replacing the fuel filter is super easy, takes about 30-45 minutes and costs about $11. I do it every year. http://www.teamshelby.com/forums/index.php/topic/83430-fuel-filter-replacement-nice-improvement-in-throttle-response/ Link to comment Share on other sites More sharing options...
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