Was going to suggest looking up Robs posts on tt.net too. He bores out stock tb to 54mm, fixes all the non-round z1 58mm tb & is now making his own custom billet 60mm tb.
On plenty of anecdotal blather, this particular engine should not perform that well. On a pull-thru(supposedly the most inneficient setup), it made almost 1500bhp in qualifying tune......... It performs rather well with a surprisingly small TB back in the mid '80's. Lookit this itty-bitty thing then. This different view is from the earlier motor with a throttle cable!! Massive or even O/sized TB's (x 2) on a road going VG30dett.......muwaaaahahahahah! Wankie wank wank!! E
I had this set up on an old 2ltr Escort motor . Although mine had a SU carby where the TB is and it was a bitch to get to idle properly . But when it was moving and on boost it was bloody awesome
I'll disagree with you this year because there is only 2 days left :rofl: There is a slight difference between pull through and push through .. push through when restrictive creates more psi build up /heat on turbo= less power at same psi. pull through has comp wheel scavenging for air and horsepower limited to what it can SUCK (not wank ) comp wheel will suck more air through a restriction than it will push through a restriction (pressure build up) I could be wrong but I'm sure you will disagree. how big is that TB ...75MM ??
YES, I will disagree. Better look it up!!!!!!!! This "comp wheel will suck more air through a restriction than it will push through a restriction" is the issue. Id say 75mm at most! These cats knew what was necessary 25 years ago to do the business. Is why i find it so amusing when we are told you MUST have a 100mm TB on an SR20...et-al to make ANY power.......Please! E
Meh, plenty of greater restrictions further down the throat. Free up head restrictions before you start opening TBs on a blown motor.
years ago when I was plumbing and doing a little bit on fluid dynamics for irragation systems the accepted norm was (and this is a lot larger scale I realise) we needed a metre of pipe diameter restriction for it to be of noticable effect, I dealt with a lot of guys who believed this. I feel the reality is the hard bend off our turbos and the length of our intake system will have larger affects on air flow than 4 mm dia on our tb's. (1 X 90* bend in water flow was considered app equal to 1 mtr of pipe)
