Possible specs/output when building a high HP street engine?

[MykeNytemare]

So, I am wondering what the real potential of the engine is if you are going with pump gas (and additive if needed). I understand the the transmission would likely need to be swapped with a 131 unit if more power is made (as well as the rear being upgraded?), but after a lot of searching here and elsewhere I see all kinds of ranges of numbers from 120hp-200hp or more (if you can find and machine a 16v abarth head). I also understand that many other things such as the frame will need to be strengthened as well if hp is doubled in such a small car. But I am wondering who has dyno numbers for their streetable spiders.

On a recent Spider FB thread, someone noted that a 2.0l with "pop up pistons" from AR, a 1.8 head and 1600 cams should make around 220hp. This seems like a lot.

I know that there needs to be machining and such as the 1.8 head really bumps up compression (potentially to unfriendly numbers for pump gas), but is this possible with just good machining or is a Twin Cam expert needed? I'm in FL so getting Mark or even Guy Croft doesnt seem doable...unless everyone feels those are two of the best ways to go.

[MattVAS]

Ok that build on the FB group will NEVER reach over 200HP.

In fact most builds do not. Over the years I've seen DYNO sheets showing over 200HP, but on every single one I've seen they DYNO set to over 60% correction factor! Which basically means they're all faking it. The only sheets I've seen truly over 200HP are the ones with full motor swaps.

So what you're talking about 120-150HP is 100% obtainable. If you don't break the 150HP line you should be fine with your stock transmission and differential. It isn't really all that hard to do.
1. High Compression Pistons (8mm dome)
2. Cams (40/80 will do)
3. Adjustable Cam Gears
4. Fully machined head with big valves
5. Complete performance exhaust (headers to tip)
6. Dual Carbs
6a. Programmable Fuel Injection

Now the part that will make a bunch of y'all angry. You do NOT need to swap heads. The head swap will not give you enough gains to over come the added cost of finding and buying a different head. Their flow numbers are not all that different especially after a good machine job.

With everything above (programmable fuel injected) we've DYNO'd a car at almost 150HP.

But if you want 120HP or about then you can achieve that with parts 1, 2, 3, 4 & a nice 32/36 Carb (or 38/38 Carb).

[MykeNytemare]

So with dual carbs (I don't want FI), getting 135 at the WHEELS is possible? You said you dynoed a car with FI near 150 so I'm assuming thats not an engine stand number!

[fiatfactory]

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[MattVAS]

So with dual carbs (I don't want FI), getting 135 at the WHEELS is possible? You said you dynoed a car with FI near 150 so I'm assuming thats not an engine stand number!

That is a true DYNO number. That is a car with wheels spinning.

[MykeNytemare]

So with dual carbs (I don't want FI), getting 135 at the WHEELS is possible? You said you dynoed a car with FI near 150 so I'm assuming thats not an engine stand number!

That is a true DYNO number. That is a car with wheels spinning.

So I know who to call when the engine build eventually begins.

[MIGHTY 8]

So, I am wondering what the real potential of the engine is if you are going with pump gas (and additive if needed). I understand the the transmission would likely need to be swapped with a 131 unit if more power is made (as well as the rear being upgraded?), but after a lot of searching here and elsewhere I see all kinds of ranges of numbers from 120hp-200hp or more (if you can find and machine a 16v abarth head). I also understand that many other things such as the frame will need to be strengthened as well if hp is doubled in such a small car. But I am wondering who has dyno numbers for their streetable spiders.

On a recent Spider FB thread, someone noted that a 2.0l with "pop up pistons" from AR, a 1.8 head and 1600 cams should make around 220hp. This seems like a lot.

I know that there needs to be machining and such as the 1.8 head really bumps up compression (potentially to unfriendly numbers for pump gas), but is this possible with just good machining or is a Twin Cam expert needed? I'm in FL so getting Mark or even Guy Croft doesnt seem doable...unless everyone feels those are two of the best ways to go.

Hi,
Regardless of where you call home, GCRE can build for you (and ship anywhere on the planet when completed.) This is the option I went, and have nothing but great things to say with working with GCRE.