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GLoBaLReBeL420 · 09-27-2018, 02:26 PM

Anyone switched over to the new 258's that Tomei is putting out? I recently jumped over to them and am noticing some pretty crazy vacuum drop at idle. With the stock cam-shafts I was pulling -20 to -21(at sea level in Cali) no problem. I just switched over to the 258's and I'm barely pulling -14 now at idle. I had to bump my idle up to 950 rpms just to keep her stable.

I haven't had a chance to dyno her yet, but I feel like she pulls WAY harder up top 5K+ but I lost a ton of torque down low (3500-5K). Just seeing if anyone else noticed the same issue?

SR20DET S13 Blacktop
Tomei 740cc injectors
GT2871R (.64AR)
SS headers
Z32 MAF
ACV-R Boost Controller @ 1.2 Bar
Walbro 255 FP
Fuel at 43 psi no vac

Any input is greatly appreciated..

Already tuned with NisTUNE

09-27-2018, 02:26 PM	#1
GLoBaLReBeL420 Leaky Injector Join Date: Aug 2005 Location: Orange,CA Posts: 117 Trader Rating: (2)	Tomei Poncams 258 . . . anyone got em? Anyone switched over to the new 258's that Tomei is putting out? I recently jumped over to them and am noticing some pretty crazy vacuum drop at idle. With the stock cam-shafts I was pulling -20 to -21(at sea level in Cali) no problem. I just switched over to the 258's and I'm barely pulling -14 now at idle. I had to bump my idle up to 950 rpms just to keep her stable. I haven't had a chance to dyno her yet, but I feel like she pulls WAY harder up top 5K+ but I lost a ton of torque down low (3500-5K). Just seeing if anyone else noticed the same issue? SR20DET S13 Blacktop Tomei 740cc injectors GT2871R (.64AR) SS headers Z32 MAF ACV-R Boost Controller @ 1.2 Bar Walbro 255 FP Fuel at 43 psi no vac Any input is greatly appreciated.. Already tuned with NisTUNE