Can the formost expert on DSM's answer several questions...

1) Should the EVO be broken in with Mobil 1 or not... Mitsu says yes, other tuners say no?

2) Do you have any comparitive numbers on your exhausts? I had an Apexi N1 on a car...and I loved the sound, HKS seems to win alot of these unbiased dyno shootouts... Got any comparitive numbers. Of course at the price your offering...its great either way.

3) What clutch options do you plan on offering for the EVO, especially for Daily driving options. The exedy twin disk sounds great, but it is definetly on short supply and high cost!

4) How does the AWD system compare to 1&2G cars...Having watched so many DSM's at E-Town break...are we going to have similar problems if make serious horsepower? Do you notice any weak links? Are there any possible upgrades already available?

Thanks,

Bump this so it stays at the top

 

Well, here are my opinions, and thanks for asking.

Mobil 1. NO problem breaking engines in on synthetic from what I can tell. One thing you have to remember is when we build a race engine we don't have ANY break in. The engine goes in the car, we start it, double check for leaks and such and strap it to the dyno. The next time it starts it goes to 9500 rpm and well over 30 psi of boost. We use Amsoil synthetic in the cars. I have NEVER seen any adverse effect of running synthetic oils in the car and breaking them in just like this. Unless something goes wrong in the tuning or the other million things that can happen, the bearings, rings and cylinder walls always look top notch when the engines are torn down.

Exhaust comparisons. I have no data on the EVO exhausts. I will however put ours up against ANYONES in performance, weight and cost. I don't see us coming in second. At the shootout this year Victor had his EVO7 there. He had an imported Japanese high dollar exhaust on the car. Downpipe, offroad and catback. I don't remember the name, it is in hot discussion on this board right now though. Anyway, looked really nice. I told him if he ran our exhaust and didn't go faster than he had the day before (13.0) then I would let him take it back off and there would be no charge. He took the challenge. The car ran consistent 12.4's at 112 mph after that. NOW, I had also given him a few tips on adjusting his HKS AFR also. I am sure that had something to do with it also. He did comment on the exhaust alone making the car feel alot stronger. Other than this one instance I have no comparisons.

Clutch options. The Exedy clutches are suppose to start coming in in steady streams soon. You have to rememeber, before a few months ago there was very, very little call for them here. With the labor involved in doing a clutch change I would recommend waiting for one of these. The unit is just SWEET and should last a long time. ACT just built some heavy duty units for a few guys. I do not think this is a good idea. We still don't know how well the thrust bearing in these cars are going to hold up. Putting that extra load on them is not a good idea in my opinion.

AWD system. The AWD system in the EVO has nothing, or should I say very little, in common with the 1G/2G DSM. It is MUCH stronger from the looks of things. Are you going to have trouble with it if you drag race it with high horsepower? Sure, sooner or later something is going to break, that is the case with anything though.

Hope this helps.

David Buschur
www.buschurracing.com

 

hey david... while ur answering questions, what school of break in do you subscribe to? Hard and fast but not abusive or the typical nice and easy approach?

 

Heh...I think he was stating that he doesen't necessarily think the engine needs broken in. As he referenced to their race engines... My .02 is the 600 mile break-in is to cover far more than the engine. Brakes...transmission...etc.

 

One question...... What's the maximum boost for a STOCK jdm Evo7 before you break anything or denotate? I've read alot on this forum and concluded that many people are sticking to 19-20psi. In Europe and Asia, people are boosting 21-22psi on stock without any problems. Why is that so? I believe Evo7 & 8s do have the same engine internals, right?

 

...cylinder wall prep has a lot more to do with how an engine "breaks in" than people realize. Sure they say they do, but not really... my last build was seated well below 20 miles using the "motoman method".

 

It's mainly a question of octane on a stock EVO. They have better and therefore can run a bit higher boost. Environment has something to do with it as well. The USA is a large place with many climates and thus their tuning approach requires larger ranges of conditions than, say, a UK or J spec EVO.

Mark

 

I see........ Thanx!

 

Sounds like run it like you intend to...hard and fast.