Travis@boostworks
Well-Known Member
- Joined
- Oct 14, 2014
- Threads
- 194
- Messages
- 2,335
- Reaction score
- 1,356
- Location
- Katy, TX
- Website
- www.boostworks.com
- Vehicle(s)
- 2015 Mustang GT
Depends on the cams, heads, etc.. sounds about right for that pulley combo.The turbo cars pull hard when the boost hits and then you are doing speeds that will get you arrested in the twinkling of an eye.
The on3(sorry to mention Travis but he asked. lol) had low mounted ball bearing 62's and seemed to hit may be at lower rpm than the top mounted Hellion with 55 Journals.
I am a PD blower type of guy(nothing wrong with preferring turbo's:cheersand love the instant/low rpm grunt you get with the KB. It does not hit quite as hard as the my old snake bite TVS which made 800 lb/ft at 2500 rpm but fizzled out after 6500 rpm. Still makes for a very fun street car(close but not quite as much fun as my GT 350 as a street car) without needing to hit the warp speeds that you get into quickly with the turbo's.
I thought it was fun with the 4 inch pulley ......but it is just outrageous now with the 3.5 pulley.
Travis,I am not sure why I was seeing more than 14-15 psi on the dyno with the 4 inch(my gauge read 14-15)
when we assembling the 5.2 long block(also 11.0 CR pistons like in the KB 5.0) my installer thinks the dynamic compression ratio will be higher because of the way pistons matched the GT 350 heads/valves if that makes sense.
Looking at the dyno again, graphing for speed I also think he may have been in 5 th
It did make a little more with the cut outs open but the exhaust does really narrow down after the cutouts to 2.5 in some places. I am sure the resonators are also creating some restriction.
I am sure once we sort out the plugs the 3.5 pulley will make well north of 900 as it was already making 3.5 psi before spark blow out.
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