70mm or 75mm??

dannyb785 · 02-21-2005, 07:06 AM

performance-wise, is there a big difference between the 70mm and 75mm throttle body/plenum's, like from this site and others. in the long run, does it really matter which one you get?

WaterDR · 02-21-2005, 09:46 AM

The 75 mm will give you about 2 more hp when match witht he correct plenum. Also, if you have plans for a blower down the road, the 75 will be better. I tend to think that the 70 mm idle a little better, though.

Stevoneo · 02-21-2005, 01:42 PM

Normal rule of thumb is that if you dont have a power adder nor plan to put one in your car, than stick with 70mm.

other wise go with 75mm.

2000 STEEDA · 02-21-2005, 03:07 PM

I have a 75mm Ford Racing TB and #1 is right, idle is rougher. I even had a small problem with it killing when coming to a quick stop, but I fixed it by adjusting the TPS.

Chopper · 02-23-2005, 04:56 AM

I have an Accufab 75 mm and plenum installed and I see no idle problems at all.

WaterDR · 02-23-2005, 05:31 PM

Quote:

Originally Posted by Chopper

I have an Accufab 75 mm and plenum installed and I see no idle problems at all.

Understand. I also have a 75mm. I merely made this point because I have heard more complaints from folks with the 75 than the 70 in regards to idle. Regardless, the issue can be addressed and corrected.

buddyabe · 02-23-2005, 06:57 PM

I called Accufab today with the same question (70vs75) Accufab told me that there 70mm flows almost the same as the 75mm and they recommend that if you have a stock car with just a few bolt on's such as mufflers and air filter go with the 70mm and If you have a very free breathing engine such as headers and o/r pipe and perhaps cams and or ported heads go with the 75mm. I also asked them about idle quality and throtle response differences and they said there wouldn't be a noticeable difference between the two. I ordered The 75mm just so I don't regret it later if I ever go ahead with cams and headwork.

02-21-2005, 07:06 AM	#1 (permalink)
dannyb785 Senior Member Join Date: Feb 2005 Posts: 3,176	70mm or 75mm?? performance-wise, is there a big difference between the 70mm and 75mm throttle body/plenum's, like from this site and others. in the long run, does it really matter which one you get?

02-21-2005, 09:46 AM	#2 (permalink)
WaterDR Administrator Join Date: Sep 2004 Posts: 6,363	The 75 mm will give you about 2 more hp when match witht he correct plenum. Also, if you have plans for a blower down the road, the 75 will be better. I tend to think that the 70 mm idle a little better, though. __________________ Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump My Car My Email

02-23-2005, 04:56 AM	#5 (permalink)
Chopper Senior Member Join Date: Dec 2004 Location: Parkersburg Wv. Posts: 257	I have an Accufab 75 mm and plenum installed and I see no idle problems at all. __________________ 04 Mustang GT M5,1200 H-D Sportster Street Legal Drag Bike.1942 Flathead Chopper.1960 Cessna 172.(yes it's been modded too) BUY AMERICAN!!!

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02-21-2005, 01:42 PM	#3 (permalink)
Stevoneo Senior Member Join Date: Jan 2005 Location: Virginia Beach, VA Posts: 598	Normal rule of thumb is that if you dont have a power adder nor plan to put one in your car, than stick with 70mm. other wise go with 75mm.

02-21-2005, 03:07 PM	#4 (permalink)
2000 STEEDA Senior Member Join Date: Sep 2004 Location: Baton Rouge Posts: 326	I have a 75mm Ford Racing TB and #1 is right, idle is rougher. I even had a small problem with it killing when coming to a quick stop, but I fixed it by adjusting the TPS.

02-23-2005, 06:57 PM	#7 (permalink)
buddyabe SILVER 01 GT CONVERT AUTO Join Date: Jan 2005 Location: coon rapids mn. u.s.a. Posts: 205	I called Accufab today with the same question (70vs75) Accufab told me that there 70mm flows almost the same as the 75mm and they recommend that if you have a stock car with just a few bolt on's such as mufflers and air filter go with the 70mm and If you have a very free breathing engine such as headers and o/r pipe and perhaps cams and or ported heads go with the 75mm. I also asked them about idle quality and throtle response differences and they said there wouldn't be a noticeable difference between the two. I ordered The 75mm just so I don't regret it later if I ever go ahead with cams and headwork.