Ohhhhh yer. Down here, a dude has bult a later RX-7 as a sports sedan with an almost stock 20B save for usual intake/zorst mods and aftermarket ECU. It goes OK but its the sound of it FTW! This thing sounds absolutely insane at full cry!!!!! Post whore alert! L8r E
Zed with a SR20 > a Falcon with the turbo engine they are working on. They will both be dogs IMO. Torque is what propells a heavy car quickly NOT power. Neither of these engines will be better than what was fitted to the cars originally. Highly strung 4 cylinder engines dont have a significant life time and are usually highly geared to get the sort of performance and the acceleration we expect. ONLY part if an SR conversion that would be nice is the better weight distribution it would give and the fact that the weight would prob be behind the front axel. This is exactly why I am cutting the crap out the race car chassis ahead of the axel. BMW have got it so right.
Duuuuuuude you aint reading!!!!!!! With a little thought, your going to end up with a car much the SAME weight as its donor car. Read my post further above.There are some weight figures up there which i pulled from this very site and NissanSilvia dot com. SR20's are bulletproof at any revs and produce torque low down. Is WHY they are such a successful engine. They do it easily and year in year out. Couple with possible an even BETTER weight bias of the lightened Zed, you cant go wrong! The figures dont lie. Just mebbe for a few of you guys the heart tells the head a Zed without a VG is unnacceptable! I get that!!! L8r E
Well, I spose you could say that about any engine if its spun THAT hard ALL the time! VG spun up will launch a crankweight into orbit (or into the guys face racing next to you if your lucky!!!) Or a VG with lunch itself with that stupid array of pipes and hoses hidden away barbequeing away every time you run it lmao! No secret how many VG's these items have caused to lunch!!! SR's are no more likely to lunch a bearing or break a rocker than anything else in the real word. Frikken shitestirrer!!!!!!!!!!!!!!!! L8r E
But srsly, they do have troubles with the rocker arms. As soon as you put some decent cams in them and spin them up quick they don't like staying in one piece. Several companies make rocker stoppers to help prevent float. I still think it's a stupid idea to have a 16 valve DOHC head with only 8 cam lobes! The CA/VG design is way better.
Umm yeah, nah yeah yeah and yeah! However, 180 Kw is EASY to get from a STOCK SR with nothing more than a DP and a couple of incidental intake and zorst supporting mods. Thats my point. If your going to turn the SR at a zillion revs all day then sure, they have been known to break rockers and a raft of other dramas that affect all other engine including spun bearings, broken pistons, dropped valves, legs out of bed and so-on. Thats what decent valve springs and so-on are all about and that goes for anything, VG, SR, 1JZ, RB or even the mighty FJ. The SR will produce very healthy numbers as above and more, at surprisingly LOW revs on stock clobber. Its the sustained high revs that kills engines, not big boost pressure or torque output. Big boost and a crap tune will kill of course but tune right and theyll do it for yonks on end and do it with a surprisingly wide spread of revs. Given the amount of SR's getting around boosted to the eyeballs, cams you cant even jump over and being hammered to the weeds around drift circuits and some rocker failures are bound to happen. In the real world of occasional traffic light derbies and the odd ...... errr "spirited" run down some windy bit of road is not going to extend anything. Newhoo, I still say its a perfectly acceptable choice IF you had the right chassis with a dead motor and an SR at hand. More than a match for most TT's just about anywhere. IMHO...eat it!!! L8r E
haha planning on dropping an SR in my old girl are you? Get that DET in there ASAP and post up a video
I echo Tassuperkart! Too much weight in a Zed up front, even though it's a V6 and further back than say the Supra, 75kg's is a huge weight saving over the front axle, turn in would be fair amazing. Coupled with a GT3071R you could pull 300rwkw and have good boost threshold by ~3700 RPM which is probably earlier than most high flows on the VG30... Nothing to sneeze at. The Zed chassis is lower than say the 180sx isn't it? Plus none of the headaches associated with our cramped as hell and 2x of everything VG30, you have to admit it. No stupid servicing costs associated with a leaky Turbo etc. etc. and don't have to pull the Plenum off and do all these little annoying jobs to access a small water line that gives up.. I think it's a pretty damn good conversion, makes a lot of sense in a track car where maintaining the engine happens often.
im joining in now , all nissan engines are about the same reliability , they all normally break because of the owner . A sr is two thirds of a vg and drives like it. They do have there advantages but if your trying to go fast that old v8 saying " theres no replacement for displacement" is very true . mod for mod a vg always gets about 50% more power and torque than a sr i wonder why. dont believe all the dyno sheets you see for sr's either alot of them are total bull shit . a friend of mine had a sheet saying 290 kw atw on 14 psi yet the car couldnt even keep the wheels spinning plus the fact that that power at that boost was not really possible with a build anything like what it is .
Stock for stock, the VG30 has 1/3rd more torque than the sr20 and 1/3 more power at the same boost level. Blacktop Sr20, 183 kW (245 hp) @ 6400 rpm, 202 lb?ft (274 N?m) @ 4800 rpm, VG30DETT 300 hp (220 kW) and 283 ft?lbf (384 N?m) Anyone know at what rev's ?? As I said, Its torque that accelerates the car NOT power. This is really pushing shit up hill. At the same boost level and gearing the VG engine will ALWAYS eat a SR20 version. The only way it could be drivable and competitive would be to gear the car up forcing the SR20 to rev higher and closer to its peak torque. The VG30 DETT already does approx 2400 revs at 100klm/hr cruise the SR20 would have to be geared to do 3000-3200 revs to accelerate reasonably. This really is barking up the wrong tree. It all reminds me of the 4 cylinder VB Commodore experiment. OMG if you have ever driven a Commodore 4 with the factory 13 inch wheels (to gear it down even more) you will run a mile from playing with an sr20 on a z32. The 4 cylinder Falcon turbo that is coming will be a DOG as well. I can see it from here. Its like history repeating itself.
I was not going to get involved in this (I actually think the solution has merits) But the 4 cyl Opel motor in the commodore was a joke. 1900 cc's of crap, unfortunately for me and all those not slagging off this idea I personally know of a VB that got dusted by a worked MINI with a 1300 morris engine moster cam and twin sidies (ok this mini was a road going race car designed for Targa rallies) but for those of you in Hamilton NZ (if any of you are here) the mini was at the top of Chinamans Hill before the Commodore was halfway. Neither driver knew each other at the time but I knew both and both came to me within the next few days to tell of this crazy story. My point is even if the commodore was the best thing since sliced bread the 4 cylinder version is something thatshould be left in the darkages of urban myth where it belongs. I do not believe that the opel engine in a Commodore is a reasonable comparison
Ur missing the point Techie. Umm, oh yes, that shortened 202 eh..nice bit of kit eh....not! Toyotas used them as well for a while...what were they thinking. However, it was only 2 cylinders lighter than a 202 yer? All iron. In a straight out shootout it would fail miserably. But that is a meaningless analogy/comparison. We are talking here 75 Kilos over the front axle just to start with by adding an SR to a 2 seat NA slicktop. One plus is you got the "Starfire 4" tougher conrods to soup up your hot 202 'Rana!!!!!!!! Bewdy! How would your fat arsed 1600Kg + TT go against a boosted 1300Kg s13 then? Overall? You reckon youd have a chance anywhere? Youll loose just about everywhere no matter how good you are or think the TT is. The S13 is far lighter, more nimble, has a wider useable rev range. Possibly 300Kilos LIGHTER, 1/3 of a tonne. Thats a shiteloade and you cannot argue with that! We arent and never were talking similar boost and same gearing and blah. Its all in the posts above. Is why I suggested having a closer read. A straight swapout of the SR with a TT 2 seater would yield a pretty ponderous wagon no? Put very simply one last time, consider the Zed weighing about the same as the S13 (1300Kg) but with a miles better weight distribution (75 kilos off the front axle to start with), a slower 4.1 diff etc etc but 40 odd Kw less..... Bye bye TT just about everywhere. At worst a mighty good match for the big TT brute. Because the hybrid 4 banger Zed weighs much the same as the lightweight S13 but possibly with a vastly superior weight distribution. It will also have a miles wider useable rev range. A DP shod SR will pull like a busload of schoolboys from 2500 rpm and still keep revving past 8000rpm making useful power. No your TT VG wont...... They just aint that good!! The discussion was only whether it would be feasible to transplant an SR into a Z32. Well, it is if the right chassis is chosen. It would make a damned fine sports car too. Sorry iffen you cant see that guys but you can argue with a few simple statistics. Im out on this one. L8r E
tasuperkart- your comparing a 180rwkw sr20 which is pretty much the higher range of their bolt on power vs a 200rwkw vg with is a cat back pod filter and probably 11 psi compared it to a higher end bolt on 240rwkw+ z and the 300zx will smash the SHIT out of any sr powered car. i never lost a single drag against any S chassis, including a 200rwkw s15. why? torque. so what its 200kg heavier, its got the torque to pull it along.
lol I love this discussion. Makes me feel old though. The Backfire 4 (sic) ( 2 cylnders chopped off a 202) was only in the Sunbird. The VB Commodore had a really anemic Opel engine getting back to the Sr20/VG30 question. as the boost and power grows. The differences between the 2 engines get greater. At 20 PSI a third more power and torque out of the VG is a massive difference. You would have to rev the ass off an Sr20 (and increase gearing) to get it to accelerate due to the torque peak being way higher. Funniest part is that although the Sr20 is lighter because it is a 4 cyl in line engine it isnt appreciably shorter. Looking that earlier picture, the crank end actually looks to be in about the same spot as the crank end of the VG behind the radiator. So apart from the engine actually being a bit lighter, the positioning distance behind the cross member is about the same. I wonder if 75Kg is really that much seeing the overhang hasnt really been reduced? May get more of a gain by simply cutting off the nose just in front of the wheels ( like a BMW) It would prob have more of an effect. You wont beleive how much steel and materials I am going to cut out of the race car in front of the wheels. LMFAO
Opel 4 cyl was in the LH/LX sunbird's. Starfire was in the UC sunbird, VB-VH commodore's, T130 Toyota Corona and based off the 173/2850. If I had to use a 4 for whatever reason, 4G63. But seriously, for an engine that gives the same weight savings (almost) as an SR.... LS/ end thread.
