the inside diameter ofthe elbow is about 68-69mm. but only at the mounting flange, after that it opens up fairly quickly. so, nothing you can't rectify by sweeping out with a die grinder. only the VS with auto really has issues with the shift points been effected with the larger TB (which sucks because the missus has a VS auto)
As immortality, has pointed out the intake elbow is still quite large, measuring around the 68.5mm mark. With the Buick, this can easily be cleaned up as the elbow can be easily un-bolted for porting. In saying this though the gains I mentioned before we with an un-ported elbow (never tested one with a ported elbow before). This is because the flow area increases to over 30% meaning that engine is able to breath easier at top end.
Hi, can i ask, why does the vs ecotec have problems with shifts points and the 3800 buick doesnt...? Or actually, what i am wanting to know is .... will the fitment of a larger throttle body have no issues with shift points on a VR series 2 V6 auto. Information i have gathered from post's is that the shift points will be effected so therefore i haven't bothered doing that modification .... it would be great to know for sure if this is not the case..... as i would hit MACE up for one of there throttlebodies. Thanks for any info you can give me on this.
I have a mace throttle body in my VT and yes i can tell you that your shift points will get messed up, however the gain specifyed is solid and i think mace would be the best one to go(i don't know if the other TB sellers do but mace include a restrictor for the vaccume hose so your idle won't go to the ****).
Mine is the buick 3800 ..... asked question wanting to know if it will have the same issues with shift points as your ecotec does. How did you rectify the problem? .... tune?
hi, i've got a 3.8L vr wagon and later this year/ early next year i'm looking at getting a crow cam kit through you, but i'm also wanting to get a set of 1.8 roller rockers. and i need to know if a stage 3 cam kit will work well with the 1.8 roller rockers? if not is there a combonation that you would sugest?
I may be wrong with this but I was under the impression that the shift points in the vs onward was controlled by the computer while the auto's on the old 3.8 were not. therefore should be all sweet on the earlyer ones. unless im wrong
VR buicks were the first model to use the Electronic Auto (hence electronic shift points). The Vn and Vp buick didnt, they used a cable design.
Ok just to clear a few things up with larger throttle bodies. Installing a larger throttle body on a VN-VR will not change the shifting characteristics on an auto. This is because the characteristics of the standard vs aftermarket throttle bodies are the same compared. What I mean that per given throttle angle each one will give the same air flow characteristics, and will be in close proportion to each other. Yes the larger throttle body will definitely be able to flow more air overall then the factory item, however because the characteristics are similar the computer doesn’t have a problem. However on the ecotec throttle bodies this isn’t the case as this charactertic is different when you compare the standard throttle body to an aftermarket one. The is because the factory item has “humps” inside to archive a desired throttle characteristic (dulling throttle response). Where as the after market item machine these humps right out which are a restriction, however this results in new flow characteristic that are not in proportion with each other especially under light load where the difference is greatest. As a result the computer may get caught out at times because of it depending on your driving style. If you have the line pressures in your auto increases then it won’t be a problem. We’ve made improvements in this area through supplying things like the restrictor etc. In regards to the throttle bodies we sell, many people are happy with them small number though feel that there is room for improvement in this area. In which case we can now supply memcals to suit which sorts it out completely. Hope this clears up a few things. Cheers Steve
So in short, the shift points on my VR V6 with Greenfoam tune wont be affected by the throttlebody, and the smallest intake diameter will be 68.2mm (intake elbow?)
Thanks very much for this explanation MACE .... I didnt go for a larger throttle body before as i beleived it would stuff up the shift points, is good to know otherwise. I have a VR series 2 V6 ... I have 2 questions. Are there any gains to be had with the installation of your larger diameter TB, be it in KW or throttle response? Can you give me a price on your TB that is suitable for my car and do i need anything else for fitment (is it simply unbolt the factory one and bolt on the Mace one then connect the hoses)? I think i have seen you guys on Ebay ... is this the best place to purchase. Cheers, Josh
Hey mate, he answered both those questions just a couple posts back. Seems your in the same boat as me Quote = The larger throttle body will give you gains of around 3-5kw at the rears, and much better throttle response. The cost is $220 plus $12 express postage.
oh, ok ... thanks for that:thumbsup: do you know if it is a straight swap .... MACE may answer this also. Yep, same boat ... i have cai, exhaust, extractors, greenfoam tune..... hoping larger TB can give a little something extra.... My throttle response is already pretty good so if the larger TB betters it i reckon it would be really good.
You'll need a higher stall converter to make work well on the street. The trouble is though the power band is beyond what a standard V6 bottom end can take anyways. So to really make the most out of this cam you'll need to raise the rev limit which I'm personally not really a fan of if one wants a reliable engine. Correct. The inlet diameter is around the 68.5mm mark we've found on the V6 elbows, while the 5L manifold are around the 69mm mark. The item is a bolt on item. To give you an idea whats required check out the fitting instructions below. http://www.maceengineering.com.au/THROTTLEBODY_NONECOTEC_INSTALLATION_.pdf Cheers Steve
We're easy Bank deposit, money order, cash on delivery, paypal, credit card over the phone etc. Cheers Steve
hey mace just wondering if your still selling the vz cai via ebay..couldnt seem to find them on there?
