HP HEAVEN - exp with modding our engine
Here is their reply to me....
Hi John,
I did reply but it must not have gone through. Anyways, have you done any modifications already?
If your keeping it naturally aspirated we have seen substantial gains from the basic mods of a free flowing exhaust system. We recommened a 2.5 inch mandrel bent system with Pacemaker brand headers/extractors. If your race class allows it I would not use any mufflers at all or if you have to then obviously use 2.5 inch straight through items.
On the intake side of things over here in Australia the factory airbox was very very restrictive to keep noise down for emissions. Remove the whole box if possible on your model and use a K and N pod filter.
Lastly, we would suggest the use of an aftermarket ecu such as our own WOLF V500. With the above bolt on mods and then some ecu remapping you will be very surprised at how the car transforms. In our experience the 6VD1/6VE1 engines were heavily restricted from factory so theres a lot of power to be had just by releasing the restrictions imposed by Isuzu.
The above is just a bolt on stage and we have not done much with the autos so I don’t know how far you could push it.
If you get to the stage where you want to open the engine up for head work/ bottom end work then the very first thing needed to be addressed is the factory oil supply system to the bottom end bearings. Isuzu did a poor job of engineering in this area and when power levels start climbing its not a matter of if it will let go but when. The main problem is an oil supply issue to the number 6 bearing. It gets starved of oil and burns out leaving a nice hole in the side of the block if the rod grabs which nobody wants to have happen. There were many engines over here that were not modified in any way that had this problem occur. Keep your oil level in check lol.
Other things engineered by isuzu such as the ignition system seem to be very well done. We have seen well over 500kw at the wheels using the factory ignition with no type of amplification. The stock crank also showed no signs of cracking or any twisting at this power level also, but it was obviously balanced and prepped beforehand.
On the forced induction side of things then it first comes down to whether you want to supercharge or turbocharge. We have done both and had great power results but from our experience turbo charging is more beneficial. From a reliability, engineering and power potential point of view.
After that its just of matter of how much power you want to make. Theres still head work, pistons, rods etc for those people just wanting to make big numbers.
For your type of application a mildly powered responsive package is what you need. If forced induction is allowed in your race class then the most suited system would be a small turbocharged setup. This would give lightning response combined with decent top end power and no sign of lag. A small turbocharged 6VE1 drives like its a naturally aspirated 5 litre.
For the wolf V500 ecu, there are dealers already in USA who are familiar with the product.
Any other info you need feel free to ask.
Kind Regards,
Luke Amanatidis - Director
Mobile: 0403 045 577
Office: +61 03 9312 4555
Fax: +61 03 9312 4566
http://www.hpheaven.com.au
