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I'm no expert on the FAST 102 but I thought the water pump grinding was a C5 Corvette issue. The shop didn't grind the water pump on my 416 for the Fast in the TA. The sensor is relocated to where the EGR would go. IIRC we used an extension harness for the MAP sensor. The MAP is just easier to get to if their is an issue in the EGR spot. I think the sensor could be installed at the back of the intake if EGR is needed because the FAST is CARB certified.
If you have a shock tower brace it may be necessary to make a spacer to rise the STB. That had to be done for my car shown below.
i just considered doing this but said its not worth the xtra few hp over a fast 90.
items needed for a fast 90 install:
1)coolant crossover needs to be bent/hammerd down or removed to go with the ls6 style block offs in the rear
2)the stock map sensor fits looser so that needs to be addressed in a variety of ways
3)your stock ls1 fuel rails and stock ls1 style injectors can be used
it was designed around an ls1 so pretty straight forward
fast 102 was designed around an ls2 so....
1)coolant crossover needs to be bent/hammerd down or removed to go with the ls6 style block offs in the rear
2)most likely need some light hammering on the firewall to clearance for the 102
3)map sensor needs to be drilled if using in stock location, or use extension harness as mentioned above
4)water pump grinding or buy an ls2 pump. the ls2 pump has less material at the top so fitting the 102 isn't an issue, but the ls1 will need a ton of grinding.
5)must use ls2 fuel rails or fast rails
6)must get a completely different shorter injector or use spacers
much more investment and work to "retrofit" the 102. on an heads cam 346, an out of the box fast 102 may see 7-10 more maybe, and on a stock heads cam car a 102 may only be 3-5 more. wasnt worth it to me.
For the extra money that you'd spend on the 102, you could get a 90 or 92 and have it ported and make more power for a similar price. Plus you wouldn't have to deal with the possible fitment issues
I got a take-off LS2 pump from SDPC for like $90 back in the day. It fits no problem with a 102. The issue is with 102 TBs... the 90/92s fit without issue and also seal up to the FAST 102 decently. The 92 is a better TB if you don't have a tuner willing to mess with the 102 TB tuning issues. It gives up maybe 5HP. But the FAST 102 is 10HP better than even a ported FAST 90. And constructed better.
You'll need to re-run the brake booster line - it's setup for an LS2 so the stock one is too short.
You'll need LS2 rails and 48mm injectors (LS2 sized w/14mm o-rings).
And you will need to make some room on the firewall for the MAP sensor or run a hose and install it elsewhere or get an extension cable and run the MAP on the front of the manifold. Any works.
You'll also need to run the LS6 valley and bend the steam vents to make it work. Or go with something like the Kurt Urban system designed for the FAST 102.
Just for additional info. I was debating between both FAST intakes and the Dorman LS2. I decided to go with the Dorman LS2 at a much cheaper price but pretty similar flow numbers once you clean up the runners. I am pretty happy with it and how it complements my Head and Cam build. Actually, I love it lol.
But I still had to grind the water pump to clear the new throttle body. Also had to hammer the coolant cross over and drill out the back for the Map. All the same stuff pretty much no matter which of the larger intakes you choose.
I've flow tested several Dorman LS2 intakes - both ported and stock. The LS6 intake with a 90mm snout from TPiS or LPE flows better than any Dorman LS2 I've tested ported or not ported. The trick LS6 is pretty inexpensive $350 for the snout mod plus shipping.
The Dorman LS2 flows OK. If you want a Dorman LS2 intake I will sell you mine for $250 plus shipping. It's only been used for flow testing and is otherwise new in the box.
Last edited by 99 Black Bird T/A; 05-21-2018 at 03:43 PM.
I am running a 102 and all I had to do was bend the steam pipe down a little bit, grind the water pump (which sucked because I just bought a brand new one and didn't know about the LS2 pump or I would have bought that one). I already had some cheap aftermarket fuel rails and am still using stock injectors with no spacers. With a TSP 233/239 cam, ATI 10% pulley, and the Fast 102 I put down 430.
EDIT: I ran the MAP sensor in the back and didn't have to clearance anything on the firewall.
Having recently just done this, I ran into one small issue with my meziere pump 102 combo
The bottom left mounting ear for the throttle body hit the top of the meziere pump (where the inlet goes). Had to take maybe 1/8" off the mounting ear. This isn't a critical part so it's not clench-inducing.
For mechanical pumps, the LS2 style pump fits without modification.
05-19-2018, 01:47 AM
FAST 102 on LS1 F-Body - what has to be modified? 
