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If anything, I'd say the IMT is closer to a real thing than the Whipple kit, even though they are VERY hush hush about it. They have a history of building good supercharger kits for the K-series engines. Looks like they used a blower casting from one of the JK Wrangler Magnuson kits...
Just an update for everyone following this. Kit is running great. Beta testing kits are for sale now at a discount, but quantities are limited. There is more info on the facebook page but here is some.
Car made 440whp and 320wtq @17psi
F22c
9.6:1 Compression (This was the engine we had. At stock compression it would make even more hp)
94deg F
E85
The torque curve is just as we expected and the car drives like a V8. Any time you punch the gas you have 300wtq available at any rpm.
I have lots of questions, some around what I would call issues.
Let me just ask one: what was the IAT? A key component of this kit is the air-to-water intercooler between the supercharger and the engine. The 17psi boost is at the limit for the Lysholm 1600AX supercharge being used according to Lysholm's compressor map. At that pressure ratio, close to the max for the supercharger, they indicate discharge temps over 120C /250F with inlet temps of 20C/70F. How well did the kit's intercooler work? What was the temp of the intercooler water before and after the test?
Just an update for everyone following this. Kit is running great. Beta testing kits are for sale now at a discount, but quantities are limited. There is more info on the facebook page but here is some.
Car made 440whp and 320wtq @17psi
F22c
9.6:1 Compression (This was the engine we had. At stock compression it would make even more hp)
94deg F
E85
The torque curve is just as we expected and the car drives like a V8. Any time you punch the gas you have 300wtq available at any rpm.
curious on additional info on intake temps what fuel injectors, pump etc. any flow charts of the charger. Hp seems extremely low given The e85 and 17psi...
curious on additional info on intake temps what fuel injectors, pump etc. any flow charts of the charger. Hp seems extremely low given The e85 and 17psi...
They seem to be following the same schedule. They did it the opposite way, making a drive that went to the rear and leaving the inlet in the front. It looks like the distance from the supercharger to the throttle body is about a foot or so. In this setup about 3 ft. which may be long enough to impact throttle response.
On Mercracings KMiata kit they have the supercharger like this kit with the inlet in the back, but they put the throttle body on right after it reverses direction. Some have apparently adapted this to the S2000 using a K to S manifold adapter.
There was some discussion on IMT's Facebook page about supercharger size. They are using a TVS 1320 which is similar in compressor map the Lysholm 1600AX used here. Some said it is too small (similar to the power discussion here) and that they fitted the 1900 with the Mercracing kit.
The 1900 is definitely bigger and has maybe 3psi higher reach on the compressor map. However, I think anyone running E85 or race gas will be disappointed with a supercharger. At most the output is 18psi-19psi where an E85 turbo maybe 30psi.
This and the IMT kits would make the most sense for a street or road course driven car running 91 octane pump gas. It would provide turbo like power (a turbo on pump gas) with NA throttle response and without having to heat issues around the exhaust or turbine housing. Which is why Ford, GM, and Fiat-Chrysler use this type of supercharger on the GT500, ZL1, and Demon.
Note that the ZL1, Demon, and GT500 all have 9.x:1 compression ratios. On pump gas that will let the engine have at least 14psi and possibly 16psi-18psi. With OEM pistons it will probably be similar to the SOS at peak, about 370hp at 10psi-11psi.
