The BMW 635 CSi (E24) of the early 1980s was a popular base for tuners. This page describes the tuning of Alpina and of Herbert Hartge GmbH: Hartge offered the H6, H6S and H6SP versions with up to about 254 hp and the H6-24 with a tuned M1 engine of 330 hp, while Alpina sold finished cars and was best known for its B7 Turbo.
BMW 635 CSi tuned by Alpina and Hartge at a glance
| Stock BMW 635 CSi | 3.5 L, 218 hp, 0–100 km/h in just over 7 s, top speed 225 km/h |
|---|---|
| Hartge H6 | about 220 hp from a modified cylinder head |
| Hartge H6S | about 240 hp, modified head, camshaft, intake, exhaust and engine management |
| Hartge H6SP | about 254 hp and 340 N·m, with a higher compression ratio on top of the H6S changes |
| Hartge H6-24 | the M635 CSi’s M1 engine of 286 hp tuned to 330 hp, 0–100 km/h in 6.4 s |
| Other Hartge changes | revised suspension, stronger brakes, stiffer anti-roll bars, BBS wheels, body and interior upgrades |
| Alpina | sold finished, ready-to-drive cars; best known for the B7 Turbo; its version of the M1-derived engine was also tuned to 330 hp |
| Hartge status | no manufacturer status until 1985; customers brought their own cars to be modified |
This page is based on a single owner page on Drive2.ru about a 1983 635 CSi in H6SP specification, supplied by the owner, so the figures could not be cross-checked. The Hartge H6SP described there is not an Alpina car.
History of the BMW 635 CSi tuned by Alpina and Hartge
The page describes a 1983 BMW 635 CSi tuned by Herbert Hartge GmbH to H6SP specification. The stock 635 CSi had a 3.5-litre engine with 218 hp, accelerated from 0 to 100 km/h in a little over seven seconds and reached 225 km/h. Hartge offered stages of tune: the H6 gained about 220 hp from a modified cylinder head, the H6S about 240 hp through a modified head, camshaft, intake, exhaust and engine management, and the H6SP, the car shown, about 254 hp and 340 N·m with a higher compression ratio. The H6-24 took the 286 hp M1 engine of the M635 CSi to 330 hp, with 0–100 km/h in 6.4 seconds.
The page contrasts Hartge with Alpina: Alpina’s B7 Turbo is much better known than Hartge’s 635 CSi work, and Alpina sold finished, ready-to-drive cars, while Hartge had no manufacturer status until 1985 and customers brought their own cars to be modified. Alpina’s version of the M1-derived engine was also tuned to 330 hp. The page does not mention a 2002 model, a turbo version other than the B7 Turbo, or a 3.0-litre Alpina.
Design and features
- Hartge chassis work: revised suspension, stronger brakes, stiffer anti-roll bars and BBS wheels.
- M1 engine: both Hartge (H6-24) and Alpina tuned the M1-derived six to 330 hp.
BMW 635 CSi tuned by Alpina and Hartge versions
- Hartge H6, H6S, H6SP and H6-24.
- Alpina B7 Turbo and other Alpina 6 Series cars (our B7 page covers the B7 Turbo story).
More Alpina cars are in our Alpina collection, for example the B7, the B6 and the B12.
BMW 635 CSi tuned by Alpina and Hartge questions and answers
Did Alpina tune the BMW 635 CSi?
Yes, Alpina tuned BMW models of that era and sold finished cars; the page on which this article is based mainly describes the Hartge versions.
How much power has the Hartge H6SP?
About 254 hp and 340 N·m.
What was the Hartge H6-24?
An M635 CSi whose 286 hp M1 engine was tuned to 330 hp.
What was the difference between Alpina and Hartge?
Alpina sold ready-to-drive cars; Hartge modified cars brought in by customers and had no manufacturer status until 1985.
Sources
- BMW 635 CSi Hartge H6SP, Drive2.ru: all facts on this page
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