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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-07-2007, 02:40 PM   #1
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Default I want more Power Need some advice!!!

Ok guys so check it out....My 1.6 liter motor is dying slowly and i last dyno'd at 209whp with 196wtq with the greddy kit. I now want 275-300whp and want your opinions on which route to take.

1) buy a motor thats been imported from japan for 500 bux with low miles and good compression (its a local pick up for me so i can go check it out). Keep my greddy turbo and go with a 19T compressor wheel

2) Use the 1.8 motor in my garage that needs a rebuild. (came off a 95 miata) and go with a bigger turbo.

3) Just rebuild my 1.6 liter motor thats currently in my car and get my nice compression numbers back. (keep in mind i will have to change the crankshaft because its a short nose- even though i have no crank wobble or anything)

I dont want to spend too much money on this btw so any advice will be taken into consideration.

Only reason why i want to avoid the 1.8 route is because im scared it will cost me too much.
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Old 12-07-2007, 02:42 PM   #2
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rebuild the 1.6L with better rods and better rings.

that will be the cheapest way, you can push the GReddy to a tad over 250rwhp, but the turbo will need upgrading to go further.
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Old 12-07-2007, 02:45 PM   #3
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Rebuild and get better pistons, rings, and rods. Then you know what you've got.
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Old 12-07-2007, 02:45 PM   #4
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Originally Posted by Braineack View Post
rebuild the 1.6L with better rods and better rings.

that will be the cheapest way, you can push the GReddy to a tad over 250rwhp, but the turbo will need upgrading to go further.
So just change the rods/rings? I already know by opening the motor i will want to get new pistons w/rings/rods,valves,valve springs.... i just want to know is it really necessary?
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Old 12-07-2007, 02:53 PM   #5
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You don't have to touch the head. But the ringlands/rings are the weak link. They go before the rods, but the rods themselves are thin comparatively.

you could get away with a light build to make sure the block itself can handle things, then it's a simple of finding a turbo that will support the goals, you can crank the 15g to about 15-16psi and reach 250-260rwph, won't see much higher than that unfortunately.

but, while you're at it, mild headwork will make that turbo spool much better and even at 250 with better low-end from 210 and the odd spool will be worlds difference.
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Old 12-07-2007, 03:09 PM   #6
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Trade/sell your 1.8L for a 1.6L and do a mild build of the 1.6L on the side so that you can still drive your current car (and as hard as it is to do, turn down the boost just a notch so it lasts ever so much longer.)

I'd normally say build a 1.8L since you have it and a conversion is not a big deal, but then you'd need a new exhaust manifold and while your at it why not get a better turbo, etc... so it could get pricey overall.

Building an engine is a very slippery slope so if cost is an issue, just doing a mild shortblock build is your best bet. ~$700-800 for the CAT rods and Wiseco pistons + the cost of reboring/honing the cylinder walls + balancing + assembly + refreshening (seals/TB/WP/etc...). Headwork is $$$.

If you are more serious about breaking the 300hp mark, then I'd suggest that since you'd need a different turbo anyway, a different exhaust manifold would give you better options so you might as well build the 1.8L for the extra displacement. Not that you can't do it with a 1.6L, but the extra 200cc of displacement never hurts.
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