01-07-2022, 12:57 PM | #1247 |
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Just throwing in a dyno. This is the 85mm pulley on E60 with a super soft tune (by choice). Ace A350, Ace front pipe, and CSG Touring catback.
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01-10-2022, 07:32 PM | #1248 | |
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Quote:
I found an used one 4.67FD with ATS 1.5Way but I am not sure if I should put it on. Afraid is FD is too high and cannot make good use of the power. I have a cosworth SC as well. Thanks! |
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01-12-2022, 05:56 PM | #1249 |
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I have a Harrop 85mm with a 4.67 FD. It depends on what you're going to do with it. On the street, it's fine. On autox, it's pretty fun. On the race track, it really depends on the track. It can make it too short or make it just right. You'd have to experiment. It makes it feel~ faster since you're going through gears quicker but it may not actually be faster.
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01-12-2022, 06:19 PM | #1250 | |
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This car is all about driving feel, Thanks for your input! Toyota Camry always passed me on HWY (I thought I was driving fast but it is not ) Did you retune your ECU to match the 4.67FD or you can just plug and play the FD without retune the ECU? Thanks again! |
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01-12-2022, 09:01 PM | #1251 |
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You kinda need to retune. Your tuner needs to modify the gear ratio tables. They may charge for it even though there's no engine tuning involved. I know my tuner didn't want to give me 2 tunes, one for 4.3 and another for 4.67. If you don't correct it, you gear indicator in the dash will read wrong.
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01-13-2022, 12:52 AM | #1252 | |
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But if there is other things that screw up on the tune, then I might have to think about it again. Thanks! |
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01-13-2022, 11:57 AM | #1253 |
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I was hoping to get down to about 300whp, but clearly I was overly optimistic.
Same dyno, same fuel, 90mm pulley, and a small tune tweak from CSG. Not sure what to do at this point short of paying CSG to do a flat tune, I need to be making about 300 peak and I want to keep the ethanol for safety on track.
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01-13-2022, 06:34 PM | #1254 | |
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Quote:
smaller front-pipe?
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Second chance build... or whatever it is.
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01-13-2022, 11:32 PM | #1255 |
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01-14-2022, 09:37 AM | #1256 |
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Sure, but sometimes rules make for such things. Not sure that's the case here...
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01-14-2022, 11:40 AM | #1257 | |
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I also don't think adding exhaust restriction is a great way to go because of the added strain on components upstream from that restriction with boost. If anything, maybe a restrictor plate on the intake side (at the throttle body or somewhere along that path) might be a better way to go. That's what they used to do on the WRC cars (and possibly still do?) and in many various touring car series to limit peak power to a specific output while still getting the most low-mid range power. Other than that, maybe a 95-ish mm diameter larger pulley for slightly less boost? Not sure if that would have to be a custom job or not, as I have no idea what other pulleys are available from Harrop. That would then allow the tune to be "maxed out" and efficient, but keep power levels within your desired range. EDIT: just saw that dropping from 85 to 90mm only gave you a 5 whp drop, so probably an even larger pulley than 95mm would be needed...100 or 105mm? You'd then be dropping way out of the efficiency range of the blower, probably. Could be that an intake restrictor plate may be the better way to go.
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Last edited by Tatsu333; 01-14-2022 at 12:21 PM. Reason: Edited for suggested pulley size |
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01-14-2022, 11:53 AM | #1258 | |
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Quote:
I'll be playing it safe and staying with the 90mm for now.
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01-14-2022, 12:43 PM | #1259 | |
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Good luck!
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02-03-2022, 05:05 PM | #1260 |
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Hmmm...interesting to note that Harrop no longer lists the FRS/GT86/BRZ supercharger kit at all on their websites (Australian or US). Maybe the "pause for retooling" is a permanent end to production?
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