Crawford BPB - uninstall, yes or no?

[pcuerpo]

so i recently had the Crawford BPB installed and this is my dyno comparison:


before install




after install




do you mind sharing your inputs given the dyno charts if having the blocks is worth it or should i just remove it?

im thinking it might not also be compatible to the other parts i have installed thats why im just making that much (1whp gain from my last dyno) with adding the blocks?

some are saying i have power/torque loss too comparing the two dyno charts?

so im looking for others input as well. btw, these dynos were also done in different times (the first one was last year) and the other one was just last weekend.

and here are the other parts i have installed just in case some would ask and if it would be beneficial to know:

- Perrin BigMAF Cold Air 3" Intake
- VDS Header
- VDS Over Pipe
- VDS Front Pipe
- Perrin Catback Exhaust 2.5" Resonated

thanks!

[calmtigers]

What kind of tune are you running?


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[churchx]

Imho it's worth to retune after BPB install, to rise it's gains and lessen perf drop and highest rpms. But then again not sure if there is much sense of using it with aftermarket header and intake.

[Wayno]

Area under the curve before 6800 is higher with blocks than without.

If you haven't tuned the car with that intake, then the blocks should be the least of your worries.

I have blocks, i think they're worth it even with barely any power increase on e85 simply because how much smoother up and down shifts are with them.

[NyC Zn6]

Iirc you have no power gain when the BPB are used with e85

[Wayno]

Originally Posted by NyC Zn6

Iirc you have no power gain when the BPB are used with e85

Gee, thanks for the updates professor.

[mav1178]

The blocks shift the power band more to the left, but you lose top end.

[pcuerpo]

appreciate the replies!

sorry for missing that out but car is tuned (EcuTek) on both dynos.

i know you lose top end and gains are in the mid but with the dyno chart, is it worth it having the blocks? are the differences that big based on the charts?

[steve99]

Originally Posted by pcuerpo

appreciate the replies!

sorry for missing that out but car is tuned (EcuTek) on both dynos.

i know you lose top end and gains are in the mid but with the dyno chart, is it worth it having the blocks? are the differences that big based on the charts?

Their is no big gains NA with these cars, you have to take everything you can get.

The blocks increase the useable power and torque in the 5000 to 7000 range so if you drive in that range a lot then the blocks are usefull for you.

getting the car retuned to suit the blocks and your intake may yeild some more slight gains.

if your just interested in absolute top end hp figures then maybe the blocks are not for you, its rearly a personal preference like most mods

if you switch to E85 this may be different

[pcuerpo]

@steve99, not really after gains but more of if mods that im putting in is making significant improvements in terms of driveability of the car as a daily and doing track duties once in awhile

apparently, my friend got a mixed up on the dyno comparison he showed me (the old one is actually the new dyno and vice-versa).. they said that i was losing power below 4000 and torque loss around 5000 to 7000




so with that, is it safe to say that i dont have losses with the install of the blocks? well, except for the top end

[jaorocks1]

Since the power curve is moved sooner, doesn't that mean acceleration is quicker?

[Wayno]

My 0-60 is the same on e85, regardless of the blocks. Haven't logged petrol yet. Downsides are power drop after 7000 and running slightly less timing in areas. The driveability and smoothness of the engine and much more seemless gear shifts make them worth it imo.