ryanmac 0 Posted August 27, 2011 Report Share Posted August 27, 2011 Hi allAs I slowly collect the parts to turbo my car I have hit a slack point and I am thinking about building my short runner intake manifold. I have a few questions though....1. Is there a desired pipe diameter for the manifold....5,6,7"2. what side should the throttle body be on. I plan to fit it to the left hand side but have seen some on the right hand side...3. Can I test it on my stock N/A engine....or will I lose power/torque.....Sorry for all the questions..Cheers Ryan Link to post Share on other sites
v6horse 1 Posted August 27, 2011 Report Share Posted August 27, 2011 I cannot answer your first on second question but I have been told by the vr6specialist here in holland that running a short runner without a turbo or charger will lower your torque , however they didnt mention anything about horspower . Hope that helps. Link to post Share on other sites
Daverse 175 Posted August 27, 2011 Report Share Posted August 27, 2011 According ti Schimmel, running a sri n/a will increase hp by about 20bhp Link to post Share on other sites
Antihero1981 8 Posted August 28, 2011 Report Share Posted August 28, 2011 think inlet would suit being on rhs....couldnt fit one if you had a charger on the lhscheck ebay there are a few knock a bout designs on there , think about 400 quid for one from germany , 800 from schimmel Link to post Share on other sites
jims13 6 Posted August 28, 2011 Report Share Posted August 28, 2011 no it wont , a short runner will not give you 20bhp ..uter crapin forced induction cars they do work , but most shift the optimum trq range and bhp point.imho, they are a waste of money , when the standard mainfold flows perfectly well. they argument of better pipework run is also tish , as unless you buy a pukka 600/700 pound one , it never fits .but a proper turbo manifold and get some 2.5" intercooler pipework, for most people that wil be enough . Link to post Share on other sites
craggsy 91 Posted August 28, 2011 Report Share Posted August 28, 2011 Different on the 24v engine tho as about 1bar of boost ish is about the limit on the standard inlet Link to post Share on other sites
jims13 6 Posted August 28, 2011 Report Share Posted August 28, 2011 yes it is as craig points out diff on teh 24v .. but even then 12/14psi with a good tubby and mapping is more than enough , for all but the die hard amongst us Link to post Share on other sites
ryanmac 0 Posted August 29, 2011 Author Report Share Posted August 29, 2011 so its a waste of time really.....I take it if it is fitted to a N/A car then I will lose bottom end torque...I am stuck the now as I have started to collect parts for the conversion but can't decide if I should stay N/A or go charged....The car is going to be used on track and twisty a/b roads with a 3.6fd. The situation the now is do I go and get the spare engine I have lightened and balanced with a flowed head, some cams, six branch manifold or do I stick a nice turbo on it...... Link to post Share on other sites
FishWick 21 Posted August 31, 2011 Report Share Posted August 31, 2011 It's not a waste of money at all. Schimmel's sri DOES give 20hp. I ran it on my standard engine before going turbo and it made 40hp more with an s/c compared to the stock inlet. With boost the standard intake restricts the flow, both in 12 and 24v applications. They restrict top end power in nasp applications too.I can't speak of non schimmel intakes though but most of the ebay specials i've seen look shit. Link to post Share on other sites
jims13 6 Posted September 1, 2011 Report Share Posted September 1, 2011 sorry i just dont see how its worth it on a N/A car. the do shift the trq point , and yes the do flow better higher up , but for a money v trq/power gain , imho it isnt worth it .at the point you have done cams, filter, exhaust and 6 branch on a vr6 , had a remap done , i think you are at a point were the only sensible option is forced induction . i made good power on my old vr6 turbo , and yes it did drop trq over the last 1000 revs, but nothing that i noticed and nothing that warrented a 600/800 pounds outlay ..i tend to weigh performance items up in trq/power v money spent gains .with this in mind , the sri comes towards the bottom of my list .agreed all the ebay ones ive seen , and helped fit are of poor orientation , the welds etc look ok, but i doubt they flow to well .meaning that in this instance buy the best you can , so 600-800 for a 12v unit and around 1000 for a 24v application .this of course is only my opinon . Link to post Share on other sites
ryanmac 0 Posted September 3, 2011 Author Report Share Posted September 3, 2011 I have been looking into it a bit further and to be honest its a bit more complicated than I thought. i was planning to fabricate my own but after reading on vortex I would have to take into account the difference in runner lengths so that the rear bank of cylinder don't run lean. It apparently can be sorted by adjusting the fuelling on the ecu map though. I had planned to keep the lower section and then cut the upper section and fix the new inlet manifold to that. Link to post Share on other sites
FishWick 21 Posted September 7, 2011 Report Share Posted September 7, 2011 Agreed Jim, wasn't trying to cause a big debate or anything!A short runner on an otherwise standard car I agree won't be to many people's liking, but if you have the 3.6 final drive and cams etc, it's a completely different engine and one people would love in the mid to top end :-) Link to post Share on other sites
FishWick 21 Posted September 7, 2011 Report Share Posted September 7, 2011 I have been looking into it a bit further and to be honest its a bit more complicated than I thought. i was planning to fabricate my own but after reading on vortex I would have to take into account the difference in runner lengths so that the rear bank of cylinder don't run lean. It apparently can be sorted by adjusting the fuelling on the ecu map though. I had planned to keep the lower section and then cut the upper section and fix the new inlet manifold to that. That only becomes a problem at big boost pressures but Schimmel had no issues with lean running at 40psi boost with a 3% compensation on the back bank. All 6 of my plugs were the same colour @ 1 bar with his SRI. You would normally see sootier plugs where there is an airflow imbalance. Injector quality has a lot to do with it as well.Injectors that atmosie quickly and get into the air stream are far better than those that just wash the intake walls.I would stick to the standard inlet for now and see how that goes. If you feel you need more top end flow, you can swap to an SRI a bit further down the line. Link to post Share on other sites
jims13 6 Posted September 7, 2011 Report Share Posted September 7, 2011 i knew that kev my point was / is , as you have said on a otherstandard car it isnt worth it.most people will not pay for a properly engineered item , they simply look at the cost and think i can do that for say 500 pounds less.. its the time that goes into developing that you end up paying for . quite often the manufacturing cost is secondary to the develpment time. Link to post Share on other sites
rodney 17 Posted September 7, 2011 Report Share Posted September 7, 2011 buy a quality one then put in storage until the Turbo arrives... then fit it....... Link to post Share on other sites
FishWick 21 Posted September 8, 2011 Report Share Posted September 8, 2011 Defo agreed on that. You can't quantify development time unfortunately. All people see is a peice of metal costing £500+ !! Link to post Share on other sites
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