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Ecotec swap the Miata or E46?


Toothbob
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So we have been running a 1.6L Miata in that other race series. Its dead reliable but just achingly slow. We have decided we want to move into Chump and are at a crossroads.

The ecotec swap on these cars seems awfully appealing in that we can use our existing car and get a nice performance bump. But most of us are BMW guys and the E46 is such a great platform that we have outside experience with it seems like a real option. Of course we could just run it as is and use all the points the 1.6 gets and make it more competitive that way.

Any thoughts or opinions that might help us make a decision?

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Just depends on how much you're looking to spend. Another ground up build vs building on what you've got.

 

Pull the 1.6 

 

BP swap will be more cost efficient

 

Dont know much on the ecotec but I know our chassis development has allowed us to start hanging with them. 

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RWHP numbers from the E46 aren't very impressive.  

 

E46 Dyno Thread https://forum.e46fanatics.com/showthread.php?t=768715

 

There are better RWHP/LB numbers in the Miata with an ecotec, but 2hrs is not going to happen and I've heard bad things about a fuel cell in the Miata.

 

I'm considering moving from JDM BP to cam'ed 2.2L ecotec.

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  • Technical Advisory Committee
20 minutes ago, Toothbob said:

So how does the economics of an ecotec swap work with a $1500 limit? The kit is a grand, you can find a motor for $500ish. Doesn't leave you much room.

For 2020 the price cap has been raised to $2,500 .

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1 hour ago, Toothbob said:

So how does the economics of an ecotec swap work with a $1500 limit? The kit is a grand, you can find a motor for $500ish. Doesn't leave you much room.

If you can do your own harness, the only other real costs is the exhaust manifold.  Like you, I campaigned a 1.8 Miata for years and years.  It was dead nuts reliable and our best finish ever was a 5th in its first race.  Since then, we did have a bunch of top tens but never approached the podium.  After doing the swap with our 1.6 parts car, it's been a lot of work to get the car to finish a race...but the car is fast.  Last weekend was our first good one, our 6th weekend with the swap.   Seems like more but when you only race 3 times a year, you don't run that many races.  If someone had given me the information I can give you, your teething pains will be a lot less.  Ping me privately if you go forward with an Ecotec swap.    

Edited by Jer
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